cứu em ơi, anh cj ơi

1. I used to enjoy / was enjoying history when I was in primary school but now it's very difficult.

( used to v: đã từng làm gì và bây giờ không còn làm nữa)

2. He gave / was giving a presentation in the communication skills class when the computer stopped / was stopping working.

(past continuous when simple past : khi 1 hành động đang diễn ra thì hành động khác xen vào)

3. Did you spend / Were you spending a lot of money when you were on holiday last year?

( last là dấu hiệu của simple past)

4. It was raining / used to rain when we left the house but later the sun came / was coming out. 

5. I played / was playing on my phone when I received / was receiving a text.

(past continuous when simple past : khi 1 hành động đang diễn ra thì hành động khác xen vào)

6. My parents didn't use to let / weren't letting me go out on school days.

7. The children made / were making so much noise in the playground that they didn't hear / weren't hearing the bell.

(S + V + so + adj + that + S + V: quá...đến nỗi mà

8. We decided/ were deciding to have a cup of coffee while we used to shop / were shopping in the city centre. 

(While + past/ present continous, past/ present countinous: khi 1 hành động song song trong hiện tại hoặc quá khứ)