Both are correct! I assume you know the difference between the Present Perfect and the Past Perfect. I told you about it in another thread and so did many other forum members.
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pleasehelpWhat about:Yes, of course! Actually, it's much better than the original "Has she really done what was best for the kids", as 'is' indicates that it's still best for them. Sorry, I said that your first example was correct too hastily. It
Has she really done what is best for the kids.
Is this sentence correct?
pleasehelpWhat need would that be?But I asked you to guess.
pleasehelpCan you give me an example using the same sentence?Yes, that will be fair. I will produce a wider context and you try to guess what that 'need' is, ok?