1. They enjoy staying on a farm during summer vacation.

2. We shouldn't throw rubbish in the street

3. If we keep our environment clean, we will live a happier and healthier life

4. At the moment, where is she going?

5. My father usually watches TV at night

6. He won't go to the meeting next week

7. We can’t use it because the water here is polluted

8. My mother has never visited Ha Long Bay before

9. If it is sunny next week, we will have a picnic in the mountain

10. We couldn't speak English when we were five years old

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Có sai thì đừng xóa nha huhu:(( đúng thì cho tớ xin 5 sao vs cảm ơn ạ<3

`1.` They enjoy staying on a farm during summer vacation.

`->` enjoy + V_ing: thích làm điều gì đó

`2.` We shouldn't throw rubbish in the street.

`->` shouldn't + V_inf: không nên làm điều gì đó

`3.` If we keep our environment clean, we will live a happier and healthier life.

`+` Cấu trúc câu điều kiện loại `1`: If + S + Vs/es, S + will + V_inf

`-` dùng để dự đoán một hành động, sự việc có thể xảy ra trong tương lai.

`4` At the moment, where is she going?

`@` at the moment: `DHNB` thì HTTD

`-` she là chủ ngữ số ít `->` tobe là is

`+` Cấu trúc:  Am/is/are + S + V_ing...?

`5.` My father usually watches TV at night.

`@` usually: `DHNB` thì HTĐ

`-` My father là chủ ngữ số ít `->` động từ watch thêm "es"

`+` Cấu trúc: S + Vs/es

`6.` He won't go to the meeting next week.

`@` next week: `DHNB` thì TLĐ

`+` Cấu trúc: S + won't + V_inf

`7.` We can’t use it because the water here is polluted.

`->` can't + V_inf: ko thể làm điều gì đó

`8.` My mother has never visited Ha Long Bay before.

`@` never: `DHNB` thì HTHT

`-` My mother là chủ ngữ số ít `->` trợ động từ là has

`+` Cấu trúc: S + have/has + Ved/V3

`9.` If it is sunny next week, we will have a picnic in the mountain.

`+` Cấu trúc câu điều kiện loại `1`: If + S + Vs/es, S + will + V_inf

`-` dùng để dự đoán một hành động, sự việc có thể xảy ra trong tương lai.

`10.` We couldn't speak English when we were five years old.

`->` couldn't + V_inf: ko thể làm điều gì đó