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90% of the time, speakers of English use just 7,500 words in speech and writing. These words appear in red, and are graded with stars. One-star words are frequent, two-star words are more frequent, and three-star words are the most frequent.
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You must be tired after your long journey.
There must be some mistake – no one called Shaw lives here.
They must have got lost or they'd be here by now.
I must have fallen asleep.
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 British English definition of must. View American English definition of must.
feeling or showing happiness