We substitute "must" with "to have to".
Be careful: The negation of must means not allowed to.
| Tense | Modal | Form |
|---|---|---|
| Simple Present | I must play football. | I have to play football. |
| Simple Past | Do not use must in the Simple Past. | I had to play football. |
| will-future | Do not use must in the will-future. | I will have to play football. |
| Tense | Modal | Form | |
|---|---|---|---|
| Simple Present | 1 | I must not play football. I mustn't play football. |
I am not allowed to play football. I'm not allowed to play football. |
| 2 | I need not play football. I needn't play football. |
I do not have to play football. I don't have to play football. |
|
| 3 | I do not need to play football. I don't need to play football. |
||
| Simple Past | 1 | Do not use must not in the Simple Past. | I was not allowed to play football. I wasn't allowed to play football. |
| 2 | Do not use need not in the Simple Past. | I did not have to play football. I didn't have to play football. |
|
| 3 | I did not need to play football. I didn't need to play football. |
||
| will-future | 1 | Do not use must not in the will-future. | I will not be allowed to play football. I won't be allowed to play football. |
| 2 | Do not use need not in the will-future. | I will not have to play football. I won't have to play football. |
|
| 3 | I will not need to play football. I won't need to play football. |
| Tense | Modal | Form | |
|---|---|---|---|
| Simple Present | 4 | Must he play football? | Does he have to play football? |
| 5 | Does he need to play football? | ||
| Simple Past | 4 | Do not use must in the Simple Past. | Did he have to play football? |
| 5 | Did he need to play football? | ||
| will-future | 4 | Do not use must in the will-future. | Will he have to play football? |
| 5 | Will he need to play football? |
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