Giai thích giúp mik vì sao chọn từ đó luôn ah 

VD:1. Mary (burn) ………burnt……………. her hand when she (cook) …was cooking………………….the dinner.

Một hành động đang xảy ra và một hành động khác xen vào.

Exercise 5: Give the correct tense of the verbs in brackets (the simple past or past progressive).

2. While Joan was writing the report, Henry (look) ……………………. for more information.

3. While I (walk) ……………………. around the park, I (see) …………………….Mr Smith.

4. I (be) …………………….very tired because I (work) …………………….all day yesterday.

5. What you (do) ……………………. at  this time yesterday?

Exercise 6: Give the correct tense of the verbs in brackets.

1. He (already, go) ……………………. before I came there.

2. After my sister (wash) ……………………. her clothes she began to study.

3. Bill (work) ……………………. at the University for 40 years before he (retire) ……………………..

4. John (live) ……….…… in Paris for one year then his parents cameto visit him.

5. It was the first time I (ever see) ……………………. such a beautiful girl.

Exercise 1: Give the correct tense of the verbs in brackets.

1. My father usually (have) ………………….. tea after breakfast.

2. Tom (play) …………………….. tennis everyday.

3. The water (boil) …………………….. at 100 degrees cencius.

4. It (not rain) …………………….. in dry season.

5. What you usually (do) …………………….. at weekend?

Exercise 2: Give the correct tense of the verbs in brackets.

1. My grandfather __________________ (buy) some fruits at the supermarket.

2. Hannah __________________ (not study) French in the library. She’s at home with her classmates.

3. My dog __________________ (eat) now.

4. All of Jack’s friends __________________ (have) fun at the concert right now.

5. Listen! Our teacher __________________ (speak).

Exercise 3: Give the correct tense of the verbs in brackets.

1. I ……………….(study) Vietnamese for the last 20 years.

2. We….…………….(known) each other for 5 years.

3. I…..…………… (sleep) for 3 minutes now.

4. How long you ….…………… (learn) Japanese? I….…………… ( learn) it since 2015.

5. He already….………..…….( read) that blog for 2 months.