1.This is the best book (that / which)I have ever read.
2. This is all (that/ which) I want.
My answer
1. that 2. that
I studied that we use 'that' and not 'which' after the superlative degree and after the word 'all' .
Is this true? Can't we use 'which' in these two cases at all?
Use that in your sentences for the reasons you have mentioned. If all refers to people , who is common: All who/that have seen it have liked it. CB
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Use that in your sentences for the reasons you have mentioned. If all refers to people, who is common:
All who/that have seen it have liked it.
CB