`1.` watching

`→` Cấu trúc `:` enjoy `+` Ving `:` thích làm gì đó

`2.` were

`→` Đây là câu điều kiện loại `2`

`→` Cấu trúc `:` If `S` `+` were `+` `S1` , `S` `+` would `+` `Vo`

`3.` had travelled

`→` Do có từ said ( thì `QKĐ` )

`→` Đây là câu trần thuật

`→` Lùi thì `→` thì `QKHT`

`4.` will find

`→` Cấu trúc `:` `S` `+` believe `+` `S1` `+` will `Vo`

`5.` have known

`→` Dấu hiệu `:` for thousands of years

`→` thì `H``T``H``T`

II. Supply the corect tense or form of the verb in parentheses.

1. Did you enjoy (watch)….......watching............................ the film?

`->` enjoy + Ving : thích làm gì

2. If I (be)…........were................................. you, I would plant vegetables in the garden.

`->`  ĐK loại `2` 

3. He said that before the invention of the airplane people (travel)............had travelled................... by train and car.

`->` Câu trần thuật `->` lùi thì `->` QKĐ 

4. We believe scientists (find).........will fine...................... cures to HIV soon.

5. People (know)…......have known.............................. all about the Moon for thousands of years.

`->` Thì HTHT 

`->` Cấu trúc : S + have/has + V3