Student or Learner
when should I use whether ? and what are the cases where I should use if ?
For example, if I say
1-How do I know if he says the truth or not?
2- How do I know whether he says the truth or not?
which sentence is correct and why?
thanks in advance
Whether is common when we have a clear binary choice, especially when or not is used. Here, whether works better for me.