Question

It worried me a lot _______ I would pass the exam.

Answer 1

if和whether都可译为"是否",二者引导宾语从句时通常可以互相替换,口语中多用if代替whether.例如：Ask if/whether he plans to come to the meeting. 而以下几种情况中, 只能用whether:

1. 强调两方面的选择,特别是句中有or not时.如：

Let me know whether you can come or not.