Hi. You can use both of them. It has nothing to do with the verb look .
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AnonymousIs look followed by if or whether acceptable?You might hear these expressions in very informal situations but I would avoid them as they are non-standard.
I will look if / whether the mailman has come yet.
AnonymousIs look followed by if or whether acceptable?It seems peculiar to my ear. 'look and see' would be more idiomatic, I'd say.
I will look if / whether the mailman has come yet.
AnonymousWould you give me a typical example of look if or whether, MalRey?Can you tell from the way a couple look whether they are happy together?
Anonymous"look" can be followed by "whether" or "if", where "whether" or "if" function as a direct object of the conjunction.I claim it can't be done. Let's see if anyone can make a breakthrough and prove me wrong!