Bổ sung thêm 1 số từ: had better ; would rather ; used to ; be able to ; ought to
Modal V ( đt khiếm khuyết) luôn đi với V (bare)
VD: I have to go out now!
I used to play tennis.
Modal V + be + Vpp nha ( câu bị động )
VD : People can learn many languages
⇒ Laguahes can be learnt
VD: We have to wear uniform when we go to school
⇒ Uniform has to "be" worn by us when...
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