初中英语知识点微课课件考点精讲 同课异构 56 形式主语

形式主语 —It’s very nice of you to help me solve such a big problem. —_____. A. That’s all right. B. Don’t worry. C. It’s my pleasure. D. Take it easy. 一、典例精析 【解析】句意是帮我解决如此一个大的难题,你真是太好了。这是一个it做形式主语，真正主语动词不定式置于句末的句子。That’s all right.没关系;Don’t worry.不要担心;It’s my pleasure.这是我的荣幸;Take it easy.放松点;根据上文,结合语境可知选C。 【答案】 C It 作为形式主语的用法 当不定式、动名词、从句 等用作句子主语时，为保持句子平衡，通常把真正的主语放在句末，而在句首使用形式主语it。 二、考点剖析 拒绝是令人遗憾的。 记住这一点是很重要的。 It’s a pity to refuse. It’s very improtant to remember this. 一、代替动词不定式做形式主语 ①It +be +adj.+（for sb.）to do sth. 此处adj. 通常为描述事件的形容词：easy，difficult，hard，necessary，impossible， important，natural, likely，obvious，useful，useless，dangerous… 做某事是… It’s necessary for us to master a foreign language. ②It +be+ adj.+ of sb. to do sth 此处adj. 通常为描述人的形容词：kind，nice，rude，cruel，careless，foolish，stupid，wise，crazy… 某人做某事，某人是… eg. It’s foolish of you to drive a car after drinking. It’s very kind of you to help me with my English. ③It + be +名词词组+动词不定式 eg. It is not a good habit to stay up too late. 常见句型： It takes/took sb. some time/money to do sth. It is no good crying over spilt milk. It is no use casting pearls before swine . 覆水难收 不要明珠暗投，对牛弹琴 构成如下结构： It is +no use/no good/not any good/not any use…+ doing sth. 二、代替动名词作形式主语 ①It + be + 名词词组 + 主语从句 这类名词有：a fact, a pity, a shame, an honour，a question，a surprise，common knowledge… eg.It’s common knowledge that people can't live without water . 三、代替从句做形式主语 ②It + 不及物动词 + that（as if）-从句 这类不及物动词有：look，seem，appear，happen eg.It seems that he does not tell the truth. It is time +that sb. +v-ed/ should do Eg. It’s time that you went to bed It’s time that you should go to bed. It’s necessary/ impossible/ important/ natural that sb. (should) do Eg. It’s important that we (should) keep the balance of nature. ③It + be +adj.+that-从句 ④It + be +-ed（过去分词）+ that-从句 It is said that… 据说… It is reported that… 据报道… It is supposed that… 据推测… It is hoped that… 希望… It is well known that… 众所周知… It is generally considered that…普遍认为… It is suggested that… 有人建议… 三、巩固提升 It’s very kind _____you to help me with my maths. It is hard _____me to learn it well. A. of; for B. of; of C. for; of D. for; for 【解析】这里的of表示所有关系，for表示动作的对象或接受者,意为“给……”、“对…… (而言)”，be kind of sb 就是说某人很友好 固定的搭配。所以选A。 【答案】A It 作为形式主语的用法：当不定式、动名词、从句 等用作句子主语时，为保持句子平衡，通常把真正的主语放在句末，而在句首使用形式主语it。 判断 代替动词不定式做形式主语 代替从句做形式主语 形式主语 四、思维导图 代替动名词作形式主语 ... ...