问个初中英语

If you do not know the answer, it is all right to tell the teacher that you do not know.

这句为什要that


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这句话的语法分析如下:

主句:

If you do not know the answer, it is all right to tell the teacher
从句:

that you do not know
主句中的成分:

主语:you
谓语:do not know
宾语:the answer
代词:it(指代主句中的

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