I don't know whether or not to do it. This is great I don't I should do it or I shouldn't. This should be: I don't know if I should do it or if I shouldn't or: I don't know if I should do it or not. I don't know whether or not I take it as a compliment. This should be: I don't know whether or not I should take it as a complement I don't know I should take it as a compliment or I shouldn't. This should be: I don't know if I should take it as a compliment or not.