I didn't know ___ to call him
whether
She is confused about ___ her purse was stolen or nor
whether
___ you turn left at the traffic lights, you will see the post office on the right
if
We were arguing about ___ we should let our son attend the party
whether
Do you know ___ John is coming to the party?
both are correct
You'll get fat ___ you eat all that chocolate
if
She asked the police woman ___ the criminal had been caught
if
They don't remember ___ or not they closed the bathroom window
whether
I asked her ___ she was hungry
both are correct
I wasn't sure ___ to walk or take the bus
whether
I have to decide ___ to study history or economics
whether
___ we don't leave now, we'll miss our train
if
They aren't sure ___ or not it will rain tomorrow
whether
I'll leave work early ___ my boss allows it
if
His final grade depends on ___ he submits the assignment on time
whether
We need to know ___ or not you'll be attending the meeting
whether
Have you decided ___ to buy a bicycle or a car?
whether
___ or not you decide to accept the offer is of little concern to me
Whether
___ the weather is nice, we can go to the park
If