USES
CORRECT THE SENTENCE: I can read when I was five.
I could/was able to read when I was five.
Scientists ........ (future ability) create a medicine to cure cancer.
Scientists will be able to create a medicine to cure cancer.
I'm sure John locked the office before leaving. He always does.
He must have locked the office before leaving.
Which modals are used to express possibility?
may, might, & could
CORRECT THE SENTENCE: My sister have to set the table at home.
My sister has to set the table at home.
You look pale, you ......... (certainity) be sick.
You look pale, you must be sick.
It was a mistake to sell the house. I wish I hadn't.
I shouldn't have sold the house.
Which modal is used to express lack of obligation?
don't have to, needn't, don't need to
The teacher must finish her grading. She's carrying the exams.
The teacher must have finished her grading. She is carrying the exams.
Tomorrow we are going on a school trip, you____________ (lack of obligation) bring your books.
don't have to / needn't / don't need to
I'm sure Ann didn't send that message. It was probably a virus.
Ann can't have sent that message.
Which modals are used to express a present necessity or obligation in the affirmative?
have to, must and need to.
CORRECT THE SENTENCE: Last year, he must take the B1 test to pass the subject. (past obligation)
Last year, he had to take the B1 test to pass the subject.
In Spain we ________________(expression: not permission) drive a car if we are under 18.
aren't allowed to
She didn't come to the party. Did she get the invitation?
She might not have got the invitation.
CORRECT THE SENTENCE: She mustn't be ill, I have seen her at the bar this morning.
She can't be ill, I have seen her at the bar this morning.
didn't have to / didn't need to
I got locked inside my home and I couldn't arrive on time.
I would have arrived on time but I got locked inside my home.