Help with sentence

Only 2 and 3 are correct.

CliveOnly 2 and 3 are correct.

Thanks for your help, teacher. That was what I though.

I asked because I saw a native speaker use ‘of’ in this sentence: "What is the explanation of the use of this title"

So ‘of’ would also not be correct in that sentence and what you said previously applies to that sentence as well. Right?

"What is the explanation of the use of this title"
I wouldn't say this is wrong, but it is awkward, unnatural and unclear.
Better is
eg What is the reason for this title?
eg Why is this title used?
eg

Clive"What is the explanation of the use of this title"I wouldn't say this is wrong, but it is awkward, unnatural and unclear.Better iseg What is the reason for this title?eg Why is this title used?eg What does this title mean?

Got it. Thanks for your examples.

But just to confirm, and although you examples are better, both 'for the use' and 'for usin

Yes, both are correct. But my 3 suggestions are better.

CliveYes, both are correct. But my 3 suggestions are better.

Got it. Thanks a lot teacher for your help!