Correct Usage of IF and WHETHER

WHETHER vs IF

Are you buffled as to when and how you are going to use whether and if ?

Well, then keep on reading for this article may be the answer you've been searching for.

First, let us try to know what part of speech do whether and if belong.

Whether is a conjunction which is used when talking about a choice you have to make or about two different possibilities.

I can't tell whether or not my teacher likes me.

If is also a conjunction which is used to introduce a phrase when something else depends on that action and situation (conditional sentences). 

We'll have to leave tonight if it doesn't rain. 

If I drink too much coke, my stomach aches.

Now, take note of this. Whether and If can also be used in similar contexts. Both can be used when you are asking or deciding whether something is true or will happen.

Do you have any idea whether/if we still need to work on Christmas Day?

Both can also be used when changing a DIRECT SPEECH into an INDIRECT SPEECH (for questions answerable by yes or no).

DIRECT SPEECH

My teacher asked, "Is your mother OK?

INDIRECT SPEECH

My teacher asked me whether/if my mother was OK.

However, whether is usually used together in sentences with the word or, especially at the beginning of a sentence.

Whether you see Kaaren or not, I'll be there tomorrow. (not if you see Kaaren or not)

On the other hand, use if instead of whether with clauses following some verbs and adjectives.

Trisha wasn't sure if she could come. (not whether)

But, use whether instead of if before infinitives.

The question is whether to leave or stay.(not if)

Also after prepositions

It depends on whether you're prepared or not. (not if)

And before nouns

It's your decision whether you leave or stay. (not if)

Please leave a comment or suggestion that would make this article better. Thank you!