`1`. If he didn't have to study for his exam, he could go out

`2`. If he hadn't felt tired, I could play football this afternoon.

`3`. If she had a collage degree, she could be employed

`4`. If the weather hadn't been terrible, we wouldn't have put off our trip.

`5`. If she weren't lazy, she could pass the exam.

`6`. If he didn't smoke too much, he could get rid of his cough.

`7`. If she hadn't walked to the meeting, she wouldn't have been late.

`8`. If I had eaten lunch, I wouln't feel hungry now.

`9`. If you tell lies to your boss, you'll be fired at once.

`10`. If you are impatient, you will make mistakes.

`11`. If you don't study hard, you won't pass the exam.

`12`. If you don't tell me the truth, I won't help you.

`-------------`

`@` Câu điều kiện loại `1`;

`-` If + S + V(s/es) ~ am/is/are + adj/N, S + will/may/can + V-bare

`-` If + S + do/does + V-bare, S + will/can/may (not) + V-bare

`=>` Diễn tả hành động có thể xảy ra ở hiện tại hoặc tương lai

`@` Câu điều kiện loại `2`

`-` If + S + V2/ed ~ Were + adj/N, S + would/could/might + V-bare

`-` If + S + did + not + V-bare, S + would/could/might + V-bare

`=>` Diễn tả hành động không có thật ở hiện tại.

`@` Câu điều kiện loại `3`:

`-` If + S + had + V3/ed, S + would/could/might + have + V3/ed

`=>`  Diễn tả hành động không có thật ở quá khứ.

`@` Câu điều kiện hỗn hợp loại `1`:

`-` If + S + had + V3/ed, S + would/could + V-bare