He must speak English well as he has lived in England since his childhood.

Knowledge: Modal verbs

Explain:

May + V (infinitive): perhaps, can do

Perhaps: perhaps

Sure: sure

Though S + V: although

Must + V-infinitive: what to do. In addition, must + V-infinitive is also used to make sure guesses in the present.

He must speak English very well because he has lived in England since he was a child.

= I’m sure he speaks English well because he has lived in England since he was a child.

A. Maybe he speaks English well because he has lived in England since he was a child. => wrong in meaning

B. He can speak English well because he has lived in England since he was a child. => wrong in meaning

D. He speaks good English even though he hasn’t lived in England since he was a child. => wrong in meaning

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