The children don’t go to school in the snowy weather.
A.
B.If it weren’t snowy, the children could go to school
C.
D.If it hadn’t been snowy, the children could have gone to school.

Leave me alone or I’ll call the police.
A.Unless you leave me alone, I’ll call the police.
B.If you didn’t leave me alone, I would call the police.
C.
D.Unless you not leave me alone, I’ll call the police.

We got lost because we didn’t have a map.
A.If we had a map, we wouldn’t get lost
B.If we had had a map, we wouldn’t have hot lost.
C.If we hadn’t a map, we wouldn’t get lost.
D.If we had had a map, we wouldn’t get lost.

If he had told the truth, the police wouldn’t have arrested him.
A.
B.He told the truth, so the police didn’t arrest him.
C.He doesn’t tell the truth, so the police arrest him.
D.He had told the truth, so the police didn’t arrest him.

Stop talking or you won’t understand the lesson.
A.If you stop talking, you won’t understand the lesson.
B.If you don’t stop talking, you won’t understand the lesson.
C.If you didn’t stop talking, you wouldn’t understand the lesson.
D.If you hadn’t stopped talking, you wouldn’t understand the lesson.

If I were a bird, I would fly high in the sky.
A.
B.Were I to be a bird, I would fly high in the sky.
C.Should I be a bird, I would fly high in the sky.
D.Had I been a bird, I would fly high in the sky.

The match can be cancelled because it rains heavily.
A.If it hadn’t rained heavily, the match couldn’t have been cancelled.
B.If it didn’t rain heavily, the match couldn’t be cancelled.
C.If it hadn’t rained heavily, the match couldn’t be cancelled.
D.If it doesn’t rain heavily, the match can’t be cancelled.

I didn’t go on holiday with my family because I was so busy.
A.If I wasn’t so busy, I would go on holiday with my family.
B.If I hadn’t been so busy, I would go on holiday with my family.
C.
D.If I hadn’t been so busy, I would have gone holiday with my family.

You would hear my explanation if you didn’t talk so much.
A.Unless you talked so much, you would hear my explanation.
B.Were you talked so much, you wouldn’t hear my explanation.
C.Were you talk so much, you wouldn’t hear my explanation.
D.Because you talked so much, you didn’t hear my explanation.

You didn’t read the instructions carefully, so you answered the wrong question.
A.If you read the instructions carefully, you would answer the wrong question.
B.If you had read the instructions carefully, you wouldn’t answer the wrong question.
C.Had you read the instructions carefully, you wouldn’t answer the wrong question.
D.If you had read the instructions carefully, you wouldn’t have answered the wrong question.