Language/English/Grammar/When-use-If-or-Whether

When to use "whether" or "if" in English?

Use only "if" with:

the conditional tense

A sentence that can only be realized under certain conditions.

• Bob didn’t know if Amanda was going away.

Use only "whether" when

the word "or"

• Bob didn’t know whether Amanda was staying in the city or going to the country side for the weekend.

Verb with "to"

• Bob didn’t know whether to invite Amanda to the party.