The difference between If and whether
1. He will call me if there is news.
2. He will call whether there is news.
The both examples look very similar
But in the first he will call only in one way, if there is news.
In the second he will call anyway, there is news or not
how about these examples?
I did not know if my mom had bought apples.
I did not know whether my mom had bought apples.
Is " I did not know if my mom had bought apples " a conditional type ?
As I know ,It doesn't contains any type of if conditional.