Question

5. She is one of those who does what she says.
Ans.​

Answer 1

Answer:

It would be understood, but it’s not precisely idiomatic, and there’s one grammatical glitch.

English speakers would render it, “… knows of the matter” — knows because the subject (one of those people) is singular, and of because idiom prefers it. You can say “knows the situation” with perfect authority, though.

You can also say “is aware of” the matter or situation, and this may be the more popular usage (at least in the case of matter), especially when the speaker wishes to sound professional