MODAL VERBS
| ABILITY /INABILITY | OBLIGATION | PROHIBITION |
| can / can’t be able to could / couldn’t | have to need to must | can’t mustn’t |
| SUGGESTION /REQUEST / OFFER | LACK OF OBLIGATION | POSSIBILITY |
| can could may would | needn’t don’t have to | can could may/might |
| ADVICE | DISBELIEF | |
| should ought to | can’t | |
