I don't doubt his ability to do it.とは 意味・読み方・使い方

There is no doubt about his ability.

There is no room for doubt as to his integrity.

There is no room for doubt as to his honesty.

His honesty is above suspicion.

I cannot help doubting his sincerity.

He has the ability [no authority] to do that.

It seems it will be impossible for him to accomplish that.

I can't help doubting his honesty.

I don't think he'll be able to settle that problem alone.

I don't think we'll be able to settle that problem with his help alone.

Try as you may, you will never get him to agree.

I don't think I can get along with him.

I do not doubt that he is sincere.

I don't doubt that he means well.

I satisfied myself of his competence.

I satisfied myself that he was competent.

He is always trying to do the impossible.

I am convinced of his innocence.

It is very doubtful [It is open to serious question] whether he really did such a thing.

I don't have the confidence to make him understand it.

He can't do that with that kind of personality.

That might be impossible for him.

I have not the least doubt of his sincerity

I do not entertain a shadow of doubt as to his sincerity.

That is probably impossible for him.

No persuasion could move him.

Small wonder that he thinks so.

I'm undecided whether to believe him or not.

the singleness of his motives could not be questioned

If it were not for his help, I might fail.