宾语从句是指在一个句子中作宾语的从句。宾语从句通常由连接词引导，如that, whether, if等等。判断一个句子是否为宾语从句，需要注意以下几点：
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宾语从句通常紧跟在及物动词、形容词或介词后面。例如：
- She knows that he is coming. (that引导的宾语从句紧跟在knows后面)
- I am surprised that you don't know. (that引导的宾语从句紧跟在surprised后面)
- He insisted that he was innocent. (that引导的宾语从句紧跟在insisted后面)
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宾语从句中的主语通常是从句中的一个词，而不是主句中的词。例如：
- She said that she was tired. (从句中的she是主语，主句中的she是宾语)
- He asked me whether I had finished. (从句中的I是主语，主句中的me是宾语)
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宾语从句通常不包含情态动词或助动词do, does, did。例如：
- I hope that he will come. (that引导的宾语从句中没有情态动词或助动词)
- She asked if I had seen the movie. (if引导的宾语从句中没有助动词)
学会了宾语从句的判断方法，我们就能更好地理解句子结构，更准确地表达自己的意思。
