Question

he knows that he was helpless in that matter identify the noun​

Answer 1

Answer:

The most common use of the verb matter is in the expression it doesn’t matter (and the less common forms it didn’t matter, it wouldn’t matter and it won’t matter). It doesn’t matter means ‘it is not important’, ‘I don’t mind’ or ‘it is not a problem’:

A:

I forgot to buy milk when I was in town.

B:

It doesn’t matter. We’ve got enough till tomorrow.