Many ESOL textbooks teach using must and have to for necessity
In common speech, however, we often use must when we make a logical guess.
Look how fast his English is improving! He must take English class!
Look how slow the internet is. There must be a lot of people on it.
Wow! He has very big arms. He must lift weights.
In all of these examples, must means I guess from logic, NOT it is necessary.
The grammar must ______(base verb) stays the same
I love the next song to illustrate must because when the singer sees the girl, he makes a logical guess.
She's so pretty that she must have a boyfriend.
When the girl talks, she expresses necessity.
She feels it is necessary to have a boyfriend when she goes out.
The chorus uses the same words.
Look around. What logical guesses can you make from your observations? Use "must!"
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