If or when

There is no conditional tense. There's a subjunctive mood to express hypotheticals or conditions contrary to fact. "If" and "when" can mean the same thing here: given that a circumstance obtains. No subjunctive required. But it would be different with

"If it were 100 degrees out [but right now, it's not], what would you have her wear?"

Wouldn't you say

What will you have her wear when
and
What would you have her wear if

Thank you

AnonymousWouldn't you only use if with the conditional tense?

No. Assuming you're using "conditional tense" to refer to 'would have', you can finish the sentence in many different ways. You don't have to use "if" just because "would" was used earlier. "when" is also all right. You might also be asking about the verb in the main clause, so let me give you s

OK I see.

I thought that would + if was always the conditional so to me this was incorrect.

What would you have her wear if it's 100 degrees out?
with 'it is' I would have used 'will'
What will you have her wear if it's 100 degrees out?




What is the difference
What would you have her wear if it's 100 degrees out?

AnonymousI thought that would + if was always the conditional so to me this was incorrect.

That's mostly true, but you've stumbled on a peculiar example where 'would' has an older meaning that's more like 'wish' or 'desire' or 'want'. Therefore, you can treat the first clause as What do you wish her to wear if/when ...? and use all the tenses as if 'wo