`1`. smoke `=>` To smoke ( (Allow) + somebody + to V + something…: dùng để diễn tả sự cho phép người nào đó làm việc gì.)
`2`. study `=>` Studying ( Find + sth +Adj+V-ing )
`3`. have `=>` to have ( It is + Adj + to V + O)
`4`. let us `=>` To let us ( It's very kind of you to + (verb))