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句子分类：简单句、并列句和复合句简单句：
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.
复合句：
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.

简单句的五种基本结构
1:  主语+谓语             Things change.
                               Did you go by plane?
                               Nobody will come.
2:  主语+连系动词+表语   Trees are green.
                                   Mr. Smith is a painter.
                                   She seems kind.
3:  主语+谓语+宾语    We don't beat children.
                              My sister will fix everything.
                              The bus caught fire.
4:  主语+谓语+直接宾语/间接宾语    He brought his wife a ring.
                                                 I'll write you a long letter.
                                                 He asked the teacher a question.
5:  主语+谓语+宾语+宾补    I found the book easy.
                                      She'll let me go.
                                      I heard the baby crying.