`18`. Our old flat was not large enough for us toe live in.

`-` Cấu trúc: Đủ để làm gì ( `2` chủ thể) : S+ be+ ( not)+ adj+ enough+ for+ sb+ to V

`19`. His brifecase was so full that the zip fastener couldn't close properlty.

`-` Cấu trúc: Quá rằng: S+ be+ so+ adj+ that+ SVO

`-` Vế trước chia QKĐ `=>` Vế sau cũng vậy

`20`. The question was so easy that we all can answer it.

`-` Giải thích giống câu `19`

`21`. He left early because the room was very crowded.

`-` Kết quả+ because+ nguyên nhân

`22`. It's too marvelous for us not to miss it.

`-` Cấu trúc: Quá đến nỗi để làm gì (`2` chủ thể) : S+ be+ too+ adj+ for+ sb+ to V

`23`. The play ended in such a unexpecting way that the audience feel silent.

`-` Cấu trúc: Quá rằng: S+ be/ V+ such+ (a/ an)+ adj+ N(s)+ that+ SVO