At a glance
- 1must: almost 100%She must be at home. The lights are on.
- 2should: likelyThey should be here soon.
- 3may / might / could: 50%It might rain later.
- 4can't: almost 0%That can't be true!
How sure?
The lights are on. They must be at home. (I'm sure.)
Take an umbrella. It might rain. (maybe)
She may be at the library. (maybe)
It could be Tom at the door. (maybe)
That can't be Anna. She's in Brazil. (I'm sure it isn't.)
must / might / may / could / can't+verb
| How sure? | Word | Example |
|---|---|---|
| about 95% yes | must | You must be tired after that long trip. |
| about 50% | might, may, could | I might go out tonight. I'm not sure. |
| about 95% no | can't | It can't be true! |
About the past
- She must have forgotten. (I'm sure she forgot.)
- They might have missed the bus.
- He can't have seen us. (I'm sure he didn't.)
Practice
Answer the questions. Get 7 out of 10 to finish this lesson.