Modal Verbs

What are Modal Verbs?

Modal verbs are special verbs which behave very differently from normal verbs. Here are some important differences:
1. Modal verbs do not take "-s" in the third person.
Examples:

• He can  speak Chinese.
• She should  be here by 9:00.

2. You use "not" to make modal verbs negative, even in Simple Present and Simple Past.
Examples:

• He should not be late.
• They might not come to the party.

3. Many modal verbs cannot be used in the past tenses or the future tenses.
Examples:

• He will can go with us. Not Correct
• She musted study very hard. Not Correct

Common Modal Verbs

Can Could May Might Must

Ought to Shall Should Will Would

For the purposes of this tutorial, we have included some expressions which are not modal verbs including had better, have to, and have got to. These expressions are closely related to modals in meaning and are often interchanged with them.

 

Modal Forms

Modal verbs can be used in a variety of different forms. Study the examples below.

Modal Simple I could swim at the beach. Modal Continuous I could be swimming at the beach right now. Modal Perfect I could have swum at the beach yesterday. Modal Perfect Continuous I could have been swimming at the beach instead of working in the office.

Passive Modal Simple The room should be cleaned once a day. Passive Modal Continuous The room should be being cleaned now. Passive Modal Perfect The room should have been cleaned yesterday. Passive Modal Perfect Continuous The room should have been being cleaned but nobody was there. (Rare form)

 

Shall

"Shall" is used to indicate future action. It is most commonly used in sentences with "I" or "we," and is often found in suggestions, such as "Shall we go?" "Shall" is also frequently used in promises or voluntary actions. In formal English, the use of "shall" to describe future events often expresses inevitability or predestination. "Shall" is much more commonly heard in British English than in American English; Americans prefer to use other forms, although they do sometimes use "shall" in suggestions or formalized language.
Examples:

• Shall I help you? suggestion
• I shall never forget where I came from. promise
• He shall become our next king. predestination
• I'm afraid Mr. Smith shall become our new director. inevitability

More Examples of "Shall"

Modal Use	Positive Forms	Negative Forms	You can also use:
shall future action (British form)	I shall be replaced by someone from the New York office. I shall be there by 8:00.	I shall not be replaced after all. I shall not be there. I have a previous obligation.	will
shall suggestions	Shall we begin dinner? Shall we move into the living room?		should
shall volunteering, promising (British form)	I shall take care of everything for you. I shall make the travel arrangements. There's no need to worry.	I shall never forget you. I shall never give up the fight for freedom.	will
shall inevitability (British form)	Man shall explore the distant regions of the universe. We shall overcome oppression.	Man shall never give up the exploration of the universe. He shall not be held back.

Will

"Will" is used with promises or voluntary actions that take place in the future. "Will" can also be used to make predictions about the future. For more information on using "will" and associated exercises, visit the Simple Future section of our Verb Tense Tutorial.
Examples:

• I promise that I will write you every single day. promise
• I will make dinner tonight. voluntary action
• He thinks it will rain tomorrow. prediction

More Examples of "Will"

Modal Use	Positive Forms	Negative Forms	You can also use:
will future action, prediction	The marketing director will be replaced by someone from the New York office. Fred will be there by 8:00.	The marketing director will not be replaced after all. Fred will not be there. He has a previous obligation.	shall
will volunteering, promising	I will take care of everything for you. I will make the travel arrangements. There's no need to worry.	I will never forget you. I will never give up the fight for freedom.	shall

Can

"Can" is one of the most commonly used modal verbs in English. It can be used to express ability or opportunity, to request or offer permission, and to show possibility or impossibility.
Examples:

• I can ride a horse. ability
• We can stay with my brother when we are in Paris. opportunity
• She cannot stay out after 10 PM. permission
• Can you hand me the stapler? request
• Any child can grow up to be president. possibility

Using "Can" in Present, Past, and Future

Most modal verbs behave quite irregularly in the past and the future. Study the chart below to learn how "can" behaves in different contexts.

Modal Use	Positive Forms 1. = Present   2. = Past   3. = Future	Negative Forms 1. = Present   2. = Past   3. = Future	You can also use:
can general ability	1. I can speak Chinese. 2. SHIFT TO "COULD" I could speak Chinese when I was a kid. 3. SHIFT TO "BE ABLE TO" I will be able to speak Chinese by the time I finish my course.	1. I can't speak Swahili. 2. SHIFT TO "COULD" I couldn't speak Swahili. 3. SHIFT TO "BE ABLE TO" I won't be able to speak Swahili.	be able to
can ability during a specific event	1. With a burst of adrenaline, people can pick up cars. 2. SHIFT TO "BE ABLE TO" With a sudden burst of adrenaline, he was able to lift the car off the child's leg. 3. SHIFT TO "BE ABLE TO" With a sudden burst of adrenaline, he will be able to lift the car.	1. Even with a burst of adrenaline, people can't pick up something that heavy. 2. SHIFT TO "BE ABLE TO" Even the weight lifter, couldn't lift the car off the child's leg. 3. SHIFT TO "BE ABLE TO" Even three men working together won't be able to lift the car.	be able to
can opportunity	1. I have some free time. I can help her now. 2. SHIFT TO "BE ABLE TO" I had some free time yesterday. I was able to help her at that time. 3. I'll have some free time tomorrow. I can help her then.	1. I don't have any time. I can't help her  now. 2. SHIFT TO "BE ABLE TO" I didn't have time yesterday. I wasn't able to help her at that time. 3. I won't have any time later. I can't help her then.	be able to
can permission	1. I can drive Susan's car when she is out of town. 2. SHIFT TO "BE ALLOWED TO " I was allowed to drive Susan's car while she was out of town last week. 3. I can drive Susan's car while she is out of town next week.	1. I can't drive Susan's car when she is out of town. 2. SHIFT TO "BE ALLOWED TO " I wasn't allowed to drive Susan's car while she was out of town last week. 3. I can't drive Susan's car while she is out of town next week.	may
can request	Can I have a glass of water? Can you give me a lift to school? Requests usually refer to the near future.	Can't I have a glass of water? Can't you give me a lift to school? Requests usually refer to the near future.	could, may
can possibility, impossibility	Anyone can become rich and famous if they know the right people. Learning a language can be a real challenge. This use is usually a generalization or a supposition.	It can't cost more than a dollar or two. You can't be 45! I thought you were about 18 years old. This use is usually a generalization or a supposition.

May

"May" is most commonly used to express possibility. It can also be used to give or request permission, although this usage is becoming less common.
Examples:

• Cheryl may be at home, or perhaps at work. possibility
• Johnny, you may leave the table when you have finished your dinner. give permission
• May I use your bathroom? request permission

Using "May" in Present, Past, and Future

Most modal verbs behave quite irregularly in the past and the future. Study the chart below to learn how "may" behaves in different contexts.

Modal Use	Positive Forms 1. = Present   2. = Past   3. = Future	Negative Forms 1. = Present   2. = Past   3. = Future	You can also use:
may possibility	1. Jack may be upset. I can't really tell if he is annoyed or tired. 2. Jack may have been upset. I couldn't really tell if he was annoyed or tired. 3. Jack may get upset if you don't tell him the truth.	1. Jack may not be upset. Perhaps he is tired. 2. Jack may not have been upset. Perhaps he was tired. 3. Jack may not get upset, even if you tell him the truth	might
may give permission	1. You may leave the table now that you're finished with your dinner. 2. SHIFT TO "BE ALLOWED TO" You were allowed to leave the table after you finished your dinner. 3. You may leave the table when you finish your dinner.	1. You may not leave the table. You're not finished with your dinner yet. 2. SHIFT TO "BE ALLOWED TO" You were not allowed to leave the table because you hadn't finished your dinner. 3. You may not leave the table until you are finished with your dinner.	can
may request permission	May I borrow your eraser? May I make a phone call? Requests usually refer to the near future.	NO NEGATIVE FORMS	can, might

Could

"Could" is used to express possibility or past ability as well as to make suggestions and requests. "Could" is also commonly used in conditional sentences as the conditional form of "can."
Examples:

• Extreme rain could cause the river to flood the city. possibility
• Nancy could ski like a pro by the age of 11. past ability
• You could see a movie or go out to dinner. suggestion
• Could I use your computer to email my boss? request
• We could go on the trip if I didn't have to work this weekend. conditional

Using "Could" in Present, Past, and Future

Most modal verbs behave quite irregularly in the past and the future. Study the chart below to learn how "could" behaves in different contexts.

Modal Use	Positive Forms 1. = Present   2. = Past   3. = Future	Negative Forms 1. = Present   2. = Past   3. = Future	You can also use:
could possibility	1. John could be the one who stole the money. 2. John could have been the one who stole the money. 3. John could go to jail for stealing the money.	1. Mary couldn't be the one who stole the money. 2. Mary couldn't have been the one who stole the money. 3. Mary couldn't possibly go to jail for the crime.	might, may
could conditional of can	1. If I had more time, I could travel around the world. 2. If I had had more time, I could have traveled around the world. 3. If I had more time this winter, I could travel around the world.	1. Even if I had more time, I couldn't travel around the world. 2. Even if I had had more time, I couldn't have traveled around the world. 3. Even if I had more time this winter, I couldn't travel around the world.
could suggestion	1. NO PRESENT FORM 2. You could have spent your vacation in Hawaii. 3. You could spend your vacation in Hawaii.	NO NEGATIVE FORMS
could past ability	I could run ten miles in my twenties. I could speak Chinese when I was a kid. "Could" cannot be used in positive sentences in which you describe a momentary or one-time ability. Yesterday, I could lift the couch by myself. Not Correct	I couldn't run more than a mile in my twenties. I couldn't speak Swahili. "Could" can be used in negative sentences in which you describe a momentary or one-time ability. Yesterday, I couldn't lift the couch by myself. Correct	be able to
could polite request	Could I have something to drink? Could I borrow your stapler? Requests usually refer to the near future.	Couldn't he come with us? Couldn't you help me with this for just a second? Requests usually refer to the near future.	can, may, might

REMEMBER: "Could not" vs. "Might not" "Could not" suggests that it is impossible for something to happen. "Might not" suggests you do not know if something happens. Examples: Jack might not have the key. Maybe he does not have the key. Jack could not have the key. It is impossible that he has the key.

Ought To

"Ought to" is used to advise or make recommendations. "Ought to" also expresses assumption or expectation as well as strong probability, often with the idea that something is deserved. "Ought not" (without "to") is used to advise against doing something, although Americans prefer the less formal forms "should not" or "had better not."
Examples:

• You ought to stop smoking. recommendation
• Jim ought to get the promotion. It is expected because he deserves it.
• This stock ought to increase in value. probability
• Mark ought not drink so much. advice against something (notice there is no "to")

Using "Ought to" in Present, Past, and Future

Most modal verbs behave quite irregularly in the past and the future. Study the chart below to learn how "ought to" behaves in different contexts.

Modal Use	Positive Forms 1. = Present   2. = Past   3. = Future	Negative Forms 1. = Present   2. = Past   3. = Future	You can also use:
ought to recommendation, advice	1. Margaret ought to exercise more. 2. Margaret ought to have exercised more so she would be better prepared for the marathon. 3. Margaret ought to come to the fitness center with us tonight.	1. Margaret ought not exercise too much. It might cause injury. 2. Margaret ought not have run the marathon. She wasn't in good shape. 3. Margaret ought not stay at home in front of the TV. She should go to the fitness center with us.	should
ought to assumption, expectation, probability	1. She ought to have the package by now. 2. She ought to have received the package yesterday. 3. She ought to receive the package tonight.	"Ought not" is used primarily to express negative recommendations. (See above.)	should

Notice "Ought not" Remember that "ought to" loses the "to" in the negative. Instead of "ought not to," we say "ought not." "Ought not" is more commonly used in British English. Americans prefer "should not." Examples: You ought not smoke so much. She ought not take such risks while skiing. They ought not carry so much cash while traveling.

Had Better

"Had better" is most commonly used to make recommendations. It can also be used to express desperate hope as well as warn people.
Examples:

• You had better take your umbrella with you today. recommendation
• That bus had better get here soon! desperate hope
• You had better watch the way you talk to me in the future! warning

Using "Had Better" in Present, Past, and Future

Most modal verbs behave quite irregularly in the past and the future. Study the chart below to learn how "had better" behaves in different contexts.

Use	Positive Forms 1. = Present   2. = Past   3. = Future	Negative Forms 1. = Present   2. = Past   3. = Future	You can also use:
had better recommendation	1. SHIFT TO "SHOULD" OR "OUGHT TO" People should unplug toasters before they clean them. 2. SHIFT TO "SHOULD HAVE" OR "OUGHT TO HAVE" You should have unplugged the toaster before you tried to clean it. 3. You had better unplug the toaster before you try to clean it.	1. SHIFT TO "SHOULD" OR "OUGHT TO" People shouldn't clean toasters without unplugging them first. 2. SHIFT TO "SHOULD HAVE" OR "OUGHT TO HAVE" You shouldn't have cleaned the toaster without unplugging it first. 3. You had better not clean the toaster until you unplug it.	should, ought to
had better desperate hope, warning	The movie had better end soon. They had better be here before we start dinner. Desperate hopes and warnings usually refer to the near future.	They had better not be late. They had better not forget Tom's birthday gift. Desperate hopes and warnings usually refer to the near future.

"Had better" is often simply pronounced as "better" in spoken English.

EXERCISES AND RELATED TOPICS

• Modal Exercise 5 have got to, had better, may and shall
• Modal Exercise 7 modal verb forms
• Modal Verb Final Test complete review

Might

"Might" is most commonly used to express possibility. It is also often used in conditional sentences. English speakers can also use "might" to make suggestions or requests, although this is less common in American English.
Examples:

• Your purse might be in the living room. possibility
• If I didn't have to work, I might go with you. conditional
• You might visit the botanical gardens during your visit. suggestion
• Might I borrow your pen? request

Using "Might" in Present, Past, and Future

Most modal verbs behave quite irregularly in the past and the future. Study the chart below to learn how "might" behaves in different contexts.

Modal Use	Positive Forms 1. = Present   2. = Past   3. = Future	Negative Forms 1. = Present   2. = Past   3. = Future	You can also use:
might possibility	1. She might be on the bus. I think her car is having problems. 2. She might have taken the bus. I'm not sure how she got to work. 3. She might take the bus to get home. I don't think Bill will be able to give her a ride.	1. She might not be on the bus. She might be walking home. 2. She might not have taken the bus. She might have walked home. 3. She might not take the bus. She might get a ride from Bill.	could, may
might conditional of may	1. If I entered the contest, I might actually win. 2. If I had entered the contest, I might actually have won. 3. If I entered the contest tomorrow, I might actually win. Unfortunately, I can't enter it.	1. Even if I entered the contest, I might not win. 2. Even if I had entered the contest, I might not have won. 3. Even if I entered the contest tomorrow, I might not win.
might suggestion	1. NO PRESENT FORM 2. You might have tried the cheese cake. 3. You might try the cheesecake.	1. NO PRESENT FORM 2. PAST FORM UNCOMMON 3. You might not want to eat the cheese cake. It's very calorific.	could
might request (British form)	Might I have something to drink? Might I borrow the stapler? Requests usually refer to the near future.	NEGATIVE FORMS UNCOMMON	could, may, can

REMEMBER: "Might not" vs. "Could not" "Might not" suggests you do not know if something happens. "Could not" suggests that it is impossible for something to happen. Examples: Jack might not have the key. Maybe he does not have the key. Jack could not have the key. It is impossible that he has the key.