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A: I failed my test. B: Really? You should study harder.
advice (common way of giving advice)
Oops!
Okay!
I may go to the party tonight.
possibility in Future
Oops!
Okay!
Can she have a cookie?
casual
Oops!
Okay!
Side effects of this medication may include upset stomach and fever.
formal and is often found in writing
Oops!
Okay!
A: It's really cold outside. B: You ought to wear a warm jacket.
advice that is correct ethically, or correct according to society's point of view
Oops!
Okay!
When I was a young child, I wasn’t able to tie my shoes.
past ability
Oops!
Okay!
Last night, there were no clouds in the sky and they could see all the stars.
past ability
Oops!
Okay!
We could go to the party tonight.
possibility in future
Oops!
Okay!
Everyone is wearing a jacket. It has to be cold.
much less formal than must; common in conversation
Oops!
Okay!
I might go to the party tonight.
less formal than May; more common in conversation
Oops!
Okay!
He was running for 2 hours. He must be tired.
belief of certainty from the speaker
Oops!
Okay!
Where are my keys? They may be in the car.
possibility in Present
Oops!
Okay!
I can meet you after school.
shows ability in present
Oops!
Okay!
Could I borrow your dictionary?
medium formal
Oops!
Okay!
A: You had better slow down. You are driving too fast!
a bit stronger; includes the idea of a warning
Oops!
Okay!
Everyone is wearing a jacket. It must be cold.
certainty from the point of view of the speaker
Oops!
Okay!
May I go to the washroom?
most formal/polite
Oops!
Okay!
Where are my keys? They could be in the car.
possibility in present
Oops!
Okay!
He might have brought the cake.
possibility in past
Oops!
Okay!
Brenda is able to run quickly.
ability in present
Oops!
Okay!
She may have gone home early.
possibility in past
Oops!
Okay!
He must have won the game.
certainty in past
Oops!
Okay!
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