名词性从句包括主语从句.ppt

Subject clause（主语从句） 主语从句是在复合句中充当主语的从句，通常放在主句谓语动词之前或由形式主语it代替，而本身放在句子末尾。 引导主语从句的连接词： 连词： whether, that 连接代词：who, whom, whose, what, which, etc. 连接副词：when,where, why, how, etc. 主语从句可放句首，此时连接词that一般不省略。主语从句也可用于It is …that… 句型。Whether引导主语从句意为“是否”，这时通常不用 if. That we need more equipment is obvious. or: It is obvious that we need more equipment. Whether we can attend the party is unknown. or: It is unknown whether we can attend the party. It用作型式主语的句子常出现于下列句型： 1)It is +adj.+that…(eg.natural/strange etc.) It is likely that their group will get ahead of us. 2)It is + n. (eg. a fact /an honor/ common knowledge)+that… It is not your fault that this has happened. 3)It is+said/reported/known/believed/ thought/proved+that… It is said that everyone in his class takes an active part in sports. 4)It seems that…似乎…….It happens that…碰巧… It happens that the prettiest birds are the worst singers. (3) It happens that…, It occurs to sb. that… 结构中的主语从句不可提前。例如： It occurred to him that he failed in the examination. (right) That he failed in the examination occurred to him. (wrong) 4) It doesn’t matter how/ whether …结构中的主语从句不可提前。例如 It doesn’t matter whether he is wrong or not. (right) Whether he is wrong or not doesn’t matter. (wrong) (5) 含主语从句的复合句是疑问句时，主语从句不可提前。例如： Is it likely that it will rain in the evening? (right) Is that it will rain in the evening likely? (wrong) 名词性从句的主谓一致 主语是名词性从句（常用what，whatever， when，where，why ，how，that，whether等 引导放在句首）时，动词通常用单数形式。例如： 1．What I am most interested in is American movies．我最感兴趣的是美国电影。 2．Whatever he says is of no importance． 无论他说什么都不重要。 3．Whoever says that is wrong． 无论谁说这话都不对。  4．That he will come is certain．他肯定会来。 5．Why he is late for class is more than I can tell．为什么他上课迟到，我也说不上来。 但在下面的句子中谓语动词要用复数形式，因为主语从句中的动词是复数，所以主语从句应当作复数看待。例如： 6．Who are going to attend the meeting have been decided by the manager． 哪些人去参加会议，已由经理做出了决定。  Object clause（宾语从句） 在一个句子中，不是由一个词组，