Material Unit 3
Completion requirements
1. Modal verbs
1.3. Possibility and certainty
may, might, can, could, must
- We use may, may not, might, might not and could when something is possible.
- It may be time for Linda to go.
- They might choose Danny.
- They could be on the train now.
- We use must and can't when we make a logical deduction. We use must when we are certain something is true and can't when we are certain something is impossible.
- That must be your mother - she said she'd phone.
- It must be quite late, because its getting dark.
- That can't be true - I saw her with my own eyes.