Thread: whether
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Unread Jul 31st, 2015, 02:41 am
susan53 susan53 is offline
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Default Re: whether

If has three uses - it can express : a) a condition, b) the idea "given that X is true" or c) the concept possibly yes, possibly no

Whether doesn't just mean if - it means if or not. So it can only be used in contexts where there is a yes or no possibility - ie replacing if when it is used with its third use. Some examples :

I don't know if/whether I shall go to the conference (possibly yes, possibly no)
He asked me if/whether I liked cats (possibly yes, possibly no)

In your context there is no yes/no possibility. Here if expresses a condition - not a yes/no alternative, and therefore whether cannot be used. Notice that it's a hypothetical condition (currently the tours are not fully equipped) and so the second form of the verb should be used :
It would be better if these were fully equipped tours

Other examples where if expresses a condition and therefore can't be replaced by whether include :

If the phone rings while I'm gone, would someone answer it please?
If I hadn't missed the plane, I'd be on the beach now!



And some where it means Given that X is true... :
If you saw him, why didn't you tell him about the meeting?
If you knew about it, you should have told me.

etc
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