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句子分類：簡單句、并列句和復合句簡單句：
1：The train arrives.
2：The sea had become calm again.
3：Everybody will say the same thing.
并列句：
1:  This is me and these are my friends.
2:  They must stay in water, or they will die.
3:  It's not cheap, but it is very good.
復合句：
1:  The office that deals with passports is upstairs.
2:  He told her that he didn't know.
3:  When he woke up, the sea become calm again.

簡單句的五種基本結構
1:  主語+謂語             Things change.
                               Did you go by plane?
                               Nobody will come.
2:  主語+連系動詞+表語   Trees are green.
                                   Mr. Smith is a painter.
                                   She seems kind.
3:  主語+謂語+賓語    We don't beat children.
                              My sister will fix everything.
                              The bus caught fire.
4:  主語+謂語+直接賓語/間接賓語    He brought his wife a ring.
                                                 I'll write you a long letter.
                                                 He asked the teacher a question.
5:  主語+謂語+賓語+賓補    I found the book easy.
                                      She'll let me go.
                                      I heard the baby crying.