O N T H E O T H E R H A N D / W H E T H E R O R N O T
ON THE OTHER HAND
We use on the other hand when we compare two things or when we make a contrast.
*** I like swimming, on the other hand my boyfriend likes skiing.
*** Most of our relatives live in a countryside, on the other hand we live in Izmir.
WHETHER OR NOT
We use whether or not to introduce alternative conditionals. We mean that neither this condition nor that one matters. The result will not change.
*** We will go on a picnic whether it's rainy or not
*** You have to obey the rules here whether or not you like.
*** I'll attend university whether my parents agree or not.