1. Rita is exhausted today because she didn't get any sleep last night.

=> If Rita had gotten some sleep last night, she wouldn't be exhausted today. ( Loại 3 (Điều kiện không có thật trong quá khứ))

2. She's very thin; perhaps that's why she feels cold so much.

`->` If she weren't so thin, she wouldn't feel cold so much. ( Loại 2 (Điều kiện không có thật ở hiện tại))

3. He never polishes his shoes, so he never looks smart.

`->` If he polished his shoes, he would look smart. (Loại 2 (Điều kiện không có thật ở hiện tại))

4. He can't park near his office; that's why he doesn't come by car.

`=>` If he could park near his office, he would come by car. ( Loại 2 (Điều kiện không có thật ở hiện tại)

5 My house is guarded by two big dogs. That's the only reason it isn't broken into every night.

`-->` If my house weren't guarded by two big dogs, it would be broken into every night.

Loại 2 (Điều kiện không có thật ở hiện tại)

6) The flats are not clearly numbered, so it is very difficult to find anyone.

`==>` If the flats were clearly numbered, it wouldn't be very difficult to find anyone. (~Loại 2 (Điều kiện không có thật ở hiện tại))

7. I don't know her e-mail address, so I can't tell you.

`-->` If I knew her e-mail address, I could tell you. (Loại 2 (Điều kiện không có thật ở hiện tại))

8. She works in the evening. She has no time to play with her children.

: If she didn't work in the evening, she would have time to play with her children. (Loại 2 (Điều kiện không có thật ở hiện tại))

9 I don't want them to be upset, so I've decided not to tell them what happened.

`==>` They would be upset if I told them what happened. 

10. I am not tall enough to join the basketball team.

`-->`  If I were taller, I could join the basketball team-> Loại 2 (Điều kiện không có thật ở hiện tại)