We all know him as a man of his word.

我们都知道他是一个讲信用的人。

We all know him as a man of his word.
我们都知道他是一个讲信用的人。
Definitely.
绝对是的。
Without credit, one cannot live in the society.
一个人如果不讲信用，就不能在社会上立足。
I am a man of word.
我是个讲信用的人。
I can't break my word!

我不能违背诺言！

I suppose you have no doubt about that.

我想对此您应该毫无疑问了吧。

I suppose you have no doubt about that.
我想对此您应该毫无疑问了吧。
Can you give me a couple more days?
可以让我再考虑两天吗？
I had no doubts about it.

对此我没有疑问。
There appears to be no doubt about the question.
显然，对这一问题没有任何疑问。