SUMMARY
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Auxiliary |
Present/Past Infinitive |
Notion |
he must |
use a computer |
obligation (by someone) |
he has to |
‘’ |
obligation (circumstances) |
he had to |
‘’ |
past + obligation |
he needs to |
‘’ |
obligation |
he doesn't have to |
‘’ |
lack of obligation |
he didn't have to |
‘’ |
past + lack of obligation |
he needn't |
‘’ |
lack of obligation |
he musn't |
‘’ |
prohibition, ban |
he should |
‘’ |
advice |
he ought to |
‘’ |
advice |
he may |
‘’ |
permission / hypothesis |
he may not |
‘’ |
prohibition, ban |
he might |
‘’ |
suggestion |
he could |
‘’ |
suggestion |
he can |
‘’ |
ability |
he will |
‘’ |
future |
he will have to |
‘’ |
future + obligation |
he won't have to |
‘’ |
future + lack of obligation |
he may have to |
‘’ |
hypothesis + obligation |
he may not have to |
‘’ |
hypothesis + lack of obligation |
he would |
‘’ |
conditional |
he would have to |
‘’ |
conditional + obligation |
he wouldn't have to use |
‘’ |
conditional + lack of obligation |
he must |
have used a computer |
past + probability |
he should |
‘’ |
past + advice |
he ought to |
‘’ |
past + advice |
he needn't |
‘’ |
past lack of obligation |
he may |
‘’ |
past + hypothesis |
he may not |
‘’ |
past + negative probability |
he might |
‘’ |
past + hypothesis |
he could |
‘’ |
past + hypothesis |
he will |
‘’ |
future in the past |
he would |
‘’ |
past + conditional |