MODAL VERBS
Prohibition/Permission/Obligation
The modal verbs can/should/must/have to/need to/ be supposed to/ be allowed to and their negative forms can be used to express these functions.
| Prohibition | Obligation | No obligation | Permission |
| not supposed to | supposed to |
|
|
| shouldn't | should |
|
|
|
|
need to | don't need to |
|
|
|
have to | don't have to |
|
| can't |
|
|
can |
| mustn't | must |
|
|
| not allowed to |
|
|
allowed to |
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