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You must be tired after your long trip.
There must be some mistake – no one named Shaw lives here.
I must have fallen asleep.
They must have gotten lost or they'd be here by now.
Tomato plants must be watered regularly.
People must realize that there are limits to what we can do.
I've told you the truth. Must I keep repeating it?
We mustn't be late.
This is the American English definition of must. View British English definition of must.
relating to the Sun, or coming from the Sun