5 =>If they understand the problem,they will find a solution

_ Câu điều kiện loại 1 : If + S + V(s/es), S + will + V 

7=> If Carol hadn't been studying, she would have answered the phone.

8 => If Rita had got sleep last night, she wouldn't be exhausted today.

_ Các câu 7,8 thuộc câu điều kiện loại 3 :

_ If + S + had + PII, S + would + have + PII 

9 => If she weren't very thin, she wouldn't feel cold so much.

10 => If he polished his shoes, he would look smart.

_ Các câu 9,10 thuộc câu điều kiện loại 2 :

_ IF + S + Ved/cột 2 , S + Would + V 

I. Complete each of the following sentences so that it means the same as the sentence before

5. They don’t understand the problem. They won’t find a solution

→ If they understand the problem they will find a solution 

-> câu ĐK loại  1 

6 Carol didn’t answer the phone because she was studying..

→ if carol hadn' been studying  she would have answered the phone 

-> câu ĐK loại 3 

7 Rita is exhausted today because she didn’t get any sleep last night.

→  if rita had got sleep at night  she wouldn't be exhausted today

-> câu ĐK loại 3 

8 She’s very thin; perhaps that’s why she feels cold so much.

→ If she weren't thin she would fell cold so much

-> câu ĐK loại 2

9 He never polishes his shoes, so he never looks smart

→ If he polished his shoes he would never look smart

-> câu ĐK loại 2