When to do what?
When to use which?
Are above grammatical?
healer When to do what? When to use which? Are above grammatical?
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healerWhen to do what?
When to use which?
Are above grammatical?
As quick, incomplete thoughts, yes.
They may be interpreted as infinitival variants of indirect questions.
How do I know when to do what?
How do I know when to use which?
Or they may be interpreted as variants of clauses with a modal verb.