If, Whether Or Not
The words ‘if’ and ‘whether’ are often used interchangeably. In most cases, it isn’t a problem. Sometimes, though, it can lead to awkwardness or misunderstanding.
Using ‘if’
‘If’ is associated with a cause and its effect, as in ‘If X (cause), then Y (effect)’.
Examples:
If I go on that ride, I will feel sick.
The melon will explode if you drop it from the tenth storey window.
In each case, the sentence suggests a predictable outcome.
If you want to indicate options, you need to change the form of the sentence. (Note the use of ‘if’ here, too).
In speech, you might hear this:
If I go on that ride or not, I will feel sick.
(Two potential ‘causes’; same result. Sickness is looming, regardless)
The melon will explode if you drop it from the tenth storey window, or not.
(It’s sure to go ‘boom’. There’s another possible cause: an explosive?)
The ‘if… or not’ construction isn’t really correct language, though, and it's clumsy when written.
There’s a better way.
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