Using "what or that" after quantifiers

Question

Did you really understand all (what / that ) he said?

what is the correct answer "what or that"? Why?

duplicate all-that-vs-all-what
– Phil Sweet
Commented May 14, 2016 at 2:05 — Phil Sweet, Commented May 14, 2016 at 2:05

Dog Lover · Accepted Answer · 2016-05-14 00:57:54Z

1

It can be either, but only if "what" is preceded by "of".

Did you really understand all that he said?

Did you really understand all of what he said?

are both correct.

answered May 14, 2016 at 0:57

Dog Lover

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