1/l/ never / travelled / by /air 2/ the students / study / for exam / now 4/ lt / be / such / cold day/ we / decide/ not / go out

`1.` I have never traveled by air before.

`-` Cấu trúc Lần đầu tiên:

`-` $S + have/has + not/never + Ved/3 ... + before$

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`2.` The students are studying for (an) exam now.

`-` "now" `->` Thì HTTD: $S + am/is/are + V_ing$

`-` Nên thêm Mạo từ (an/ the), hoặc thêm tính từ sở hữu (their) trước danh từ "exam"

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`3.` It was such a cold day that we decided not to go out.

`-` Cấu trúc Quá...đến nổi mà...

`-` $It + be + such + a/an + Adj + Noun + that ....$