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
果
————
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
果
————
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