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Modals - Coggle Diagram
Modals
other ways to show obligation
The onus in on somebody to do something
Somebody is under no obligation
Somebody is required to do something
It is somebody's duty/responsibility to do something
Infinitives
Active
Simple
You should do this
Perfect
You should have done this
Cont
You should be doing
Perfect Cont
You should have been doing this for 1 month
Passive
Simple
The work should be done
Perfect
The work should have been done
must/have to
must (internal)
have to (external)
mustn't/don't have to
mustn't (very strong rule)
don't have to (you can if you wish)
need
You needn't do it
You don't need to do it
didn't need to/needn't have done
didn't need to-it wasn't nessasary
needn't have done-crisitism-it was done for sure, and it was a bad idea
have to/have got to
You've got to (informal)+used only in present
should/ought to
advice
Ought not to
Shouldn't