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6. must not/may not
Use Examples
You mustn't work on dad's computer.
Prohibition (must is a little stronger)
You may not work on dad's computer.
7. need not
Use Examples
something is not I needn't go to the supermarket, we're going to the restaurant
necessary tonight.
8. ought to
similar to should – ought to sounds a little less subjective
Use Examples
Advice You ought to drive carefully in bad weather.
Obligation You ought to switch off the light when you leave the room.
9. shall
used instead of will in the 1st person
