6. Gravity makes balls thrown into the air fall back down.
 If there weren't gravity, the balls thrown into the air wouldn't fall back down.
CT: câu điều kiện loại II là câu điều kiện không có thật ở hiện tại:
- Câu điều kiện loại 2 diễn tả sự việc, hiện tượng không thể xảy ra ở hiện tại hoặc tương lai.
If + S + V (past simple), S + would + V (inf)
*Note: Động từ “to be” phải chia là were ở tất cả các ngôi
Eg: - If I were rich, I would travel around the world.
 - If I had money, I would buy the car.

7. He had a weak heart, which meant he couldn’t walk very far.
 His heart was so weak that he couldn’t walk very far.
CT: so.. that: quá đến nỗi
8. How did you get the idea that they were rich?
 What made you get the idea of they are rich?
How= What made
9. Pupils are not allowed to leave the classroom at any time.
 At no time aren't the pupils allowed to leave the classroom.
CT: at no time+trợ động từ+S+V
10. Patrick hadn’t heard from his uncle in Australia for over five years.
 It was over five years since Patrich last heard from his uncle in Australia.
CT: S+hadn't VPII for=It was thời gian+since+S+last+V(QKĐ)
#XIN HAY NHẤT Ạ#
#CHÚC HỌC TỐT#

`6` If there weren't gravity, the balls thrown into the air would fall back down

`->` Cấu trúc câu đk loại `2` : If + mệnh đề thì QKĐ , would + V-inf

`7` His heart was so weak that he couldn’t walk very far

`->` S + was/were + N/adj...

`8` What made you get the idea of they are rich ?

`->` What made = How

`9` At anytime aren't the pupils allowed to leave the classroom

`->` At any time +  Vaux (Trợ từ) + S + V : Không bao giờ

`10` It was over five years since Patrich last heard from his uncle in Australia

`->` Cấu trúc : It + was + time + since + S + last + Vpp