1. It is such an expensive car that I can't buy it.

- S + be + too + adj + (for O) + to V.

= It + be + such + (a/an) + N + that + S + V.

                    ( ...thật... để mà)

2. It was such a useful dictionary that I can't help buying it.

- S + be + so + adj + that + S + V.

= It + be + such + (a/an) + N + that + S + V.

                    ( ...thật... để mà)

3. The water is very hot, so we can't drink it.

(Nước nóng lắm, vì vậy chúng tôi không thể uống).

4. I haven't called her for five days.

- S + last + V(past) + for/since + time.

= S + haven't/hasn't/never + Vpp + for/since + time.

5. I used to smoke.

- used to V chỉ hành động thường xuyên xảy ra trong quá khứ nhưng không còn ở hiện tại.

=>
1. It's such an expensive car that I can't buy it.
-> such a/an adj N that ~ so adj that
2. It's such an useful dictionary that I can't help buying it.
-> such a/an adj N that ~ so adj that
3. The water is very hot, so we can't drink it.
-> so : vì vậy, vậy nên
4. I haven't called her for five days.
-> chuyển QKĐ sang HTHT, S have/has (not) V3/ed, for + khoảng thời gian
5. I used to smoke.
-> used to V : đã từng