Relative pronoun ‘that’
But there are certain antecedents which cannot be followed by the relative pronoun ‘which’.
For example:
Incorrect : I know all which he said.
Correct : I know all that he said. Or I know all he said.
The relative pronoun ‘that’ in this case may also be omitted. Other antecedents like ‘all’ include some, any, something, everything, anything, nothing etc.
For example, we can say:
Everything (that) he is saying is false.
You can take anything (that) you like.