THEORY
Which modal verb do we use to express ability in the present?
Can
You _____________ wear a uniform at this school. It's a rule.
have to / must / need to
I’m not sure, but she ______ be at home.
may / might
You must to wear a uniform at school.
You must wear a uniform at school.
He can swim well.
Which modal verb do we use to express ability in the past?
Could
It's a good idea to study more. You ___________ study more.
should
When I was younger, I ______ run very fast. I won lots of races.
could
Do you can drive?
Can you drive?
It's not a good idea to eat so much sugar.
You shouldn't eat so much sugar.
Which modal verbs do we use to express possibility?
May or might
It's wrong to tell your friends' secrets. You ____________ tell your friends' secrets.
shouldn't
When I was a little child, I ________________ speak English but now I _____________.
couldn't / can
I didn't can understand the problem
I couldn't understand the problem
It is necessary for him to clean his bedroom.
He has to clean his bedroom.
If something is a good idea we use...
Should
He has lots of toys. His dad ____________________ buy him more.
doesn't have to
________ I open the window?
Can / May
He may goes to the swimming pool.
He may go to the swimming pool.
Using mobile phones is strictly forbidden during exams.
You mustn't use mobile phones during exams.
The modal verbs Must and Have to are always the same
No. They are the same in affirmative but not in negative.
You ______________ park in a disabled parking space without permission.
mustn't
It's possible that we ___________ go to the cinema tonight.
may / might
Has he have to clean his bedroom?
Does he have to clean his bedroom?
It is compulsory for students to do their homework.
Students must do their homework.