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Hi, could you please help me here? Sometimes I have difficulties using If or Whether. For example:

(Would you like to see a movie tomorrow night?)

I'm calling to ask her if / whether she'd like to see a movie tomorrow night.

But how about this:

(Where did you leave the car keys?)

I'm calling to ask her if / whether ???????

or

(Who is your veterinarian?)

or

(What's the answer to question 5 on tonight's math homework?)

Thanks in advance.
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"if" and "whether" are used - and either one is correct - in cases like the first one you mention, which is a yes-no question embedded in a statement.

Would you like to see a movie? (Yes? or No?)

I asked if she'd like to see a movie.
I asked whether she'd like to see a movie.

Neither "if" nor "whether" can be used this way if the embedded question is a question which asks for information other than simply "yes" or "no".

Who? What? Where? When? and How? questions, then, cannot be embedded using "if" or "whether".

I hope that clears up the difficulty.

CJ
Comments  
Thanks Jim, It sure does. Emotion: smile