Possible Duplicate: When are “if” and “whether” equivalent? I was told that one can use if in constructions like: ... if A, then ... But that whether should be ...
Possible Duplicate: When are “if” and “whether” equivalent? Do these two have the same meaning: To determine if something is correct. To determine whether ...
How can I know when should I use whether or if in a sentence? I can not see any difference between whether and if. When should I use each? For me, they are the same and I am not sure if there is a ...
Are if and whether equivalent in sentences like the ones below? How to determine if my saddle is too high? How to determine whether my saddle is too high? We should check if everything ...