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在英語學習中，好多同學對如何使用whether和if感到模糊，常常誤用。下面我們分別來看一下whether和if的用法。
一、只用whether的情況：
1在表語從句和同位語從句中只能用whether表“是否”。如：
He answered my question whether he would come . The news whether our team has won the game is not known. The question is whether the book is worth baying.
2當主語從句位於主語位置上時，只能用whether表“是否”。如：
Whether it will rain is not clear . Whether they will come in time is a question . 3在介詞後面引導賓語從句表“是否”，只能用whether。如：
It all depends on whether they will support us . The discussion focused on whether they would buy a new car . 4後面直接跟動詞不定式時，只能用whether表“是否”。如：
I don’t know whether to stay or not. . 5後面緊跟or not時。如：
We didn’t know whether or not she was ready . 6引導讓步狀語從句時，只能用whether。如：
Whether you like it or not ,you must do it well . 7用if會引起歧義時。如：
Please let me know if you like it . 這個句子可有兩個意思：“請告訴我你是否喜歡。”或“如果你喜歡，請告訴我。”用whether就可以避免歧義。
二、只用if的情況1引導條件狀語從句時。如：
If it doesn’t rain tomorrow , we will go hiking . If you like it , you can take it . 2和even連用時。如：
Even if the job was difficult , they did it well . Even if it’s sunny , it a bit cold .
三、if , whether均可使用的情況1引導賓語從句。如：
I wonder if / whether the news is true or not . 2在“be +形容詞”之後。如：
He was not sure if / whether it is right or not . 3主語從句中使用了形式主語it，主語從句後置時。如：
It hasn’t been decided if / whether we shall have a class meeting .
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