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This is Everyday Grammar. I'm Alice Bryant.
这里是《每日语法》节目。我是爱丽丝·布莱恩特。
The words "if" and "whether" can be tricky for some English learners.
对于一些英语学习者来说，“if”和“whether”这两个词可能会很难。
That is because they are sometimes interchangeable.
这是因为它们有时是可以互换的。
"If" and "whether" are words that connect two or more sentences or clauses.
“If”和“whether”是连接两个或两个以上句子或从句的词。
And, sometimes, both words can signal that there are two possibilities or choices for something.
有时，这两个词都可以表示某事有两种可能性或选择。
Other times, these words are not interchangeable.
其他时候，这两个词是不能互换的。
Today, I will give you a few examples of when you must use "whether" and cannot use "if".
今天，我将会举几个例子，告诉你什么时候必须使用“whether”，而不能使用“if”。
We use the word "whether" before infinitive verbs.
我们在不定式动词前用“whether”。
In American English, the infinitive means "to+verb".
在美式英语中，不定式指的是“to+动词”。
Let's look at an example.
让我们来看一个例子。
Listen for the infinitive verb after "whether":
注意听“whether”后面的不定式动词：
I am wondering whether to get a book or magazine.
我在想是买本书还是买本杂志。
The infinitive following "whether" is "to get".
“whether”后面的不定式是“to get”。
Notice that the two possibilities here are a book or a magazine.
请注意，这里的两种可能性是一本书或一本杂志。
Notice also that the speaker did not say, I am wondering if to get a book or magazine.
还请注意，说话者说的不是，I am wondering if to get a book or magazine。
Next up are prepositions.
接下来是介词。
We use the word "whether" after prepositions.
我们在介词后面用“whether”。
In this next example, pay attention for the preposition and the word "whether", which comes after it:
在下一个例子中，注意介词和它后面的单词“whether”：
Teachers are interested in whether schools will reopen soon.
老师们对学校是否会很快重新开学很感兴趣。
Here, the preposition "in" comes before "whether".
这里，介词“in”在“whether”之前。
The two possibilities are that the schools will reopen soon or they won't.
有两种可能性，一种是学校会很快重新开学，另一种是它们不会很快重新开学。
Notice that the speaker did not say, Teachers are interested in if schools will reopen soon.
请注意，说话者说的不是，Teachers are interested in if schools will reopen soon。
And that's Everyday Grammar.
以上就是今天的《每日语法》。
