The steam is seen rising from the wet clothes.
1. 助动词和情态动词
助动词:用于构成各种时态, 语态, 语气以及否定或疑问等结构只和实义动词的一定形式构成复合谓语
1)be (am, is, are, were, been)
①“be + -ing”构成进行时态;②be + 过去分词构成被动语态;③be + 动词不定式构成复合谓语:表示按计划安排要发生的事。The prime minister is to visit Japan next year.
用于命令。You're to do your homework before you watch TV.
2)have (has, had)
①have+过去分词构成完成时态。如:Have you visited the place ? ②“have been + -ing”构成完成进行时态。如:What have you been doing these days?
3)do (does, did)
①“do not + 动词原形”构成行为动词的否定式。如:His uncle doesn’t like playing football.;②“Do+ 主语 + 动词原形”构成行为动词的一般疑问句。Does he go to work by bike every day? ③“o/did/does + 动词原形”用于祈使句或陈述句中表示加强语气。如:I did go to see her, but she wasn’t in我确实去看望她了,但她不在家。Do do some work. 请一定做点什么;④代替前面刚出现的动词以避免重复。My mother told me to go to bed early. So I did.
4)will, shall (would, should)
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