Must: no -s, no to: she must go · Past: had to (must has no past) · Short answers: Yes, I do. / No, she doesn't.
A2
Have to and must for obligation
New
Use have to (has to with he / she / it) or must when something is necessary. Have to is the usual choice for rules and duties; must is followed by the base verb without to.
subject+have to / has to / must+base verb
I have to wear a uniform at work.
She has to get up at six every day.
She have to get up at six.
She has to get up at six.
Quick Check
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Passengers show their tickets.
have to Passengers is plural: have to.
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She get up at six every day.
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Tap the words in the order of the sentence.
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One word is in the wrong form. Type the correct form.
My sister have to wear glasses.
A2
Questions and negatives with have to
New
Make questions and negatives of have to with do / does and don't / doesn't. The verb after have to stays in the base form.
Do / Does+subject+have to+base verb
Does she have to wear a uniform?
We don't have to pay for the museum.
Have you to work on Sundays?
Do you have to work on Sundays?
Quick Check
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One word is in the wrong form. Type the correct form.
Does she has to work tomorrow?
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He have to get up early on Sunday.
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We have to pay for the museum.
4/4
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Tap the words in the order of the sentence.
A2
Had to: obligation in the past
New
Must has no past form. Use had to for a past obligation; questions and negatives use did / didn't + have to.
subject+had to+base verb
I had to wait for an hour.
Did you have to pay for the parking?
I must go to the doctor yesterday.
I had to go to the doctor yesterday.
Quick Check
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She cancel her trip last week.
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One word is in the wrong form. Type the correct form.
I didn't had to pay for the ticket.
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Tap the words in the order of the sentence.
4/4
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Did they the exam again?
have to take After did use have to + base verb.
B1
Mustn't or don't have to
New
Mustn't means it is forbidden. Don't have to means it is not necessary: you can do it, but you don't need to.
subject+mustn't / don't have to+base verb
You mustn't touch the paintings.
You don't have to come, but you can.
You don't have to smoke here. It's forbidden.
You mustn't smoke here. It's forbidden.
Quick Check
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One word is in the wrong form. Type the correct form.
He doesn't has to wait for us.
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Visitors feed the animals. It's dangerous.
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Students use phones in the exam. It's against the rules.
mustn't Against the rules means forbidden: mustn't.
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You park here. It's forbidden.
B1
Must for strong guesses
New
Use must + be (or another verb) for a strong guess when you are almost sure something is true. Do not use have to for guesses.
subject+must+be / base verb
You must be tired after the trip.
He must live near here: he walks to work.
You have to be tired after such a long trip.
You must be tired after such a long trip.
Quick Check
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The lights are on. They be at home.
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One word is in the wrong form. Type the correct form.