I will let you know if he is here.
My question is I know ‘I will let you know’ is future. What about ‘if he is here’ part, does it mean future too? Something like he is going to be here? Thank you in advance.
It's ambiguous without more context. It could refer to his being here now (the speaker will go and check), or to his being here at some future time.
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It's ambiguous without more context. It could refer to his being here now (the speaker will go and check), or to his being here at some future time.