彼のやったことには何か理由があるに違いない。の英語

There must be some reason for what he has done.

The reason which he gave is hard to understand.

He has his reasons for staying there.

He has left without any reason whatever.

There must be a reason why Tom did that.

She has her reasons for doing that.

He had a good reason for doing it.

I have reason to suspect him

There is reason to suspect him.

He has his reasons for staying there.

I know why he did it.

Why did he do that?

I cannot comprehend why he did such a thing.

What motivated him to do such a thing?

Why did he leave there?

Can you tell me why you like him?

How could he possibly lose such a valuable thing?

He had a reason to dash like that.

I know why he did it.

It's no good his trying to find the true reason.

It's no use for him to try to find out the real reason.

I wonder why he is so angry.

He was fully justified in doing nothing about [having nothing to do with] the matter.

I wonder why he has committed such a rash act.

There seem to be several reasons for that.

Why do you think he said so?

Who knows why he chose that?

How did he become unpopular?―fall into disrepute?―fall into discredit?―fall into disfavour―（他動詞構文にすれば）―What made him unpopular?―What brought him into disrepute?―into discredit?―into disfavour?

What made him change his mind?

Let me know why it was that he came suddenly.