Positive
|
I He/She/It We/You/They |
must | do your homework. |
Negative
|
I He/She/It We/You/They |
mustn't | touch the pictures. |
Must/Mustn't
The modal verb must (negative: mustn't) is used when you think it is necessary to do something. Must expresses strong obligation.
Must / Mustn't have the same form in all persons.
Must is followed by the infinitive without to.
- It's a fantastic film. You must see it.
- The windows are very dirty. I must clean them.
- I mustn't forget to phone Tom.