高中英语it的用法PPT课件.ppt

It的用法;it可用来指代前文提到的人,物或事情,也可以用来指时间,金钱,距离,天气等自然现象; 1. S+ think + it + necessary +( for sb. ) to do sth. ; 2. S+ V + it + one’s duty + ( for sb. ) to do sth. /clause ;;I like ___ in the autumn when the weather is clear and bright.(04全国) A. this B. that C. it D. one;1. It is necessary to be prepared for a job interview. Having the answers ready will be of great help. 2. The Foreign Minister said, “It is our hope that the two sides will work towards peace.” 3. It is known to everybody that the moon travels round the earth once every month.; … possible It is / was + adj. necessary + ( for sb. ) to do sth. / clause important …;㈡.it的重要句型1. It is + 被强调部分 + that ...　 　 　 It was about 600 years ago that the first clock with a face and an hour hand was made. It was they that (who ) cleaned the classroom yesterday. It was in the street that I met her father. ;2. It is not until + 被强调部分 + that ... 该句型也是强调句型。主要用于强凋时间状语，译成汉语＂直到．．．才．．．＂，可以说是 not ... until ... 的强调形式。 It was not until she took off her dark glasses that I realized she was a famous film star. = Not until she took off her dark glasses did I realize she was a famous film star. = I didn’t realize she was a famous film star until she took off her dark glasses. ; 3. It is clear ( obvious， true， possible， certain....) that ..... 该句型中it 是形式主语，真正的主语是that 引导的主语从句，常译为＂清楚（显然，真的，肯定．．．）＂　是主语从句最常见的一种结构。 　　 It is very clear that he’s round and tall like a tree. 　　 = That he’s round and tall like a tree is very clear. ;4. It is important ( necessary， strange， natural...) that ... 该句型和上一个同属一个句型；由于主句中的形容词不同，that 后的从句中要用虚拟语气（should + 动词原形），should 可以省去，建??记住该句型中的形容词。 It is important that