主语从句与表语从句.ppt

主语从句和表语从句 armie A pa to tm witb and toerr wi OBL.cn  主语从句和表语从句 连词that(不可省略), whether;连 接代词who,whom, whose, whoever, what, whatever和 which;连接副词 when, where,how和why  注意: ·1.要使用陈述语序 2.that不可省略 ·3.根据意思选择恰当的连接词。 4.主语从句做主语,表语从句做表语,位 于系动词后  主语从句 1)由what等代词引起的主语从句 What the teacher said today was quite right 老师今天说的话是十分正确的。  2)由连词that引起的主语从句: That they are badly in need of help is quite clear 他们急需帮助,这是十分明显的。 但是这类句子在大多数情况下会放到整 个句子的后部去,而用代词作形式主语  3)由连接代词或连接副词以及 whether引起的主语从 句 Whether they will sell the house is not yet decided 他们是否卖掉这所房子还没有决定。  4) whatever, whoever也可引导主语从句。 Whatever was said here must be kept secret 这里说的话都应当保密 Whoever makes mistakes must correct them 凡犯了错误的人都必须改正。  注意:有时为了使句子结构平衡,避免 “头重脚轻”,常用i作形式主语,而 把从句放在后面。例如: It is a pity that she has made such a mistake 她犯了这样一个错误,真是遗憾。  这样就构成了下面一些常用句型: 1)Itis+adj./n.+从句 It is a pity/ shame that.…遗憾的是 t is possible that…很可能 It is unlikely that.不可能 2)It+不及物动词+从句 t seems/ appears that..似乎 t happened that. 碰巧  3)It+be+过去分词+从句 It is said that 据说 It is known to all that 众所周知 It is reported that..据报道… It is believed that 据信…人们相信 It is suggested that..有人建议