He is an honest person in working．

I am honest in working with you．

The last note said：I am 100 per cent honest now!

There is no doubt about it．

There is no doubt as to the truth of the story．

There is little/not much doubt about what he said．

There is some doubt whether their football team will win the match．

There can be little doubt that he will help me out．

There is no doubt that they will agree with you on this matter．

He came at a time when we needed help．

There are times when(on which)one must yield．

Don’t be angry any more．That was a time when I was in bad mood because of the failure in the test．