it语法专题练习it语法专题练习.doc

语法专题：it的用法，强调句及倒装句 考点1：it的用法及形主，形宾的特殊句式结构 1. It + be + 形容词+主语从句，如： It is uncertain whether he can come to Jenny’s birthday party or not. 注意：在句型“It is important (necessary, strange, natural) that .... ”中，that 后的从句中的谓语动词用：should + 动词原形 (虚拟语气) [例句] It’s necessary that we should have a walk now. 2. It + be + 名词词组 + 主语从句，这类名词有：a fact, a pity, a shame, an honour，a question等，如：It’s a pity that you missed the exciting football match. 3. It + be + 过去分词 + 主语从句，这类过去分词有：announced, believed, expected, hoped, decided, reported, said等，如： It is reported that 16 people were killed in the earthquake. 注意： It is suggested ( ordered /demanded/insisted/commanded... ) that ... 该句型和上一个同属一个句型，主句中的过去分词是表示请求，建议，命令等词时，that　后的从句要用虚拟语气（should + 动词原形），should 可以省；常译为“据建议；有命令．．．） 　　 It is suggested that the meeting ( should ) be put off. 　 4. It + 不及物动词(seem, appear似乎, happen碰巧，turns out结果等) + 主语从句, 这类不及物动词有：appear, happen, seem等 如：It seemed that he didn’t tell the truth. 5. It + be + 形容词 + 动词不定式该句型如果不定式的逻辑主语是由for引起，主句中的形容词通常是表示重要性，紧迫性，频繁程度等情况的形容词。 常见的形容词有： important，necessary，natural，easy，safe，common，normal，hard dangerous，unusual，rare，impossible，pleasant等。 6. It + be + 形容词 + (of sb.) + 动词不定式，这类形容词常是表示心理品质,性格特征的形容词，如：kind, nice stupid, clever, foolish, polite, impolite, silly, selfish, considerate，bad，brave， careless，clever，cruel ，good（好心的），honest，horrible，lazy，modest 等 7. It + be +名词词组 + 动词不定式，如： It is not a good habit to stay up too late. 8. It + be + 名词或形容词 + 动名词，这类名词和形容词常常是：good, no good, no use, a waste of, useless, senseless等，如：It’s a waste of time talking to her any more. 9.It + take ( sb. )+ 时间（金钱）+ 动词不定式，如：It took the workers almost three years to finish building the dam. 10. It is a pity ( a shame ... ) that该句型中，that后的从句一般用虚拟语气（should + 动词原形），should可省去．表示出乎意料，常译为“竟然”。没有这种意义时，则不用虚拟语气。 It is a pity that such a thing ( should ) happen in your class. It is a pity that he is ill. 11. It is time ( about time ，high time ) that ...该句型中that 后的从句应该用虚拟语气，值得注意的是① 常用过去时态表示虚拟．② 有时也用should + 动