We have no meanings for "know if" in our records yet.
1 Problem is, I don't know if Maxine's in the house right now.
2 I'm tired of people saying 'I don't know if that is true'.
3 After a moment, he said, I don't know if you've seen her.
4 And I don't know if we want to go quite that far.
5 Just let us know if there's something you want, her aunt said.
6 I don't know if you have ever seen a really good conjuror-
7 You asked me-toldme-tolet you know if a certain gentleman arrived.
8 I don't know if it sounded seventeen billion dollars' worth of good.
9 In reality, none of us really know if we're doing things correctly.
10 I didn't even know if I could talk without slurring my words.
11 We don't know if it has gone to other major organs yet.
12 I don't know if I believe the story about another place now.
13 I don't know if people really know how much he actually did.
14 Let us know if either of you is in any immediate danger.
15 Rees-Mogg said he did not know if the DUP's position had changed.
16 I don't even know if it is a true collection,' I say.
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