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1、有关形容词的几个重要句型It is + 形容词 + that从句【一语击破】 在该句型结构中，it通常被用作形式主语，而that从句才是真正的主语。that从句通常都被放置在句子末尾。能用于该句型的形容词有：necessary, important, certain, true, surprising, clear, possible, wrong, sad等。【精典例句】It is necessary that we help the disabled. 我们有必要帮助残疾人。It is certain that Daniel does well in his exams. Daniel考试
2、肯定考得很好。It is important that we learn all subjects well. 我们把所有功课都学好是很重要的。【巩固精练】I. 根据“It is + adj. + that从句”句型和所给提示词改写下列句子。1. We help blind people cross the road. (necessary) _2. Team members support each other. (important) _3. Some children cant go to school. (sad) _4. We go to the airport by shuttle
3、 bus. (convenient) _5. We laugh at the children in old clothes. (wrong) _II. 根据汉语意思完成下列句子。1. 很显然，他们正在做一项很重要的工作。It is clear _2. 你在行走活动前几个月开始训练是有必要的。It is necessary _.3. 一些山区的孩子不能上学是令人难过的。It is sad _ 4. 美国队很强大，但我们能赢它。It is true _5. 你看不起其他人是错误的。It is wrong _Key:I. 1. It is necessary that we help blind
4、people cross the road. 2. It is important that team members support each other. 3. It is sad that some children cant go to school. 4. It is convenient that we go to the airport by shuttle bus. 5. It is wrong that we laugh at the children in old clothes. II. 1. that they are doing an important job 2.
5、 that you start training a few months before the walk3. that some children in the mountain areas cant go to school 4. that the American team is strong, but we can still win 5. that you look down upon othersIt is + 形容词 + 动词不定式【一语击破】 在该句型中，it作形式主语，真正的主语是后面的动词不定式。【精典例句】 It is necessary to learn English
6、 well. 把英语学好很有必要。It is useful to have support teams to bring you food and drinks. 有补给队给你带来食物和饮料是很有用的。It is wise to take a map and a mobile phone. 带地图和手机是明智的。注意： 该结构也适用于动词take的句型。【精典例句】 It took about twenty years to build the Great Pyramid. 建筑大金字塔花了大约20年时间。 It takes an hour to finish the work. 做完这项工作
7、要花一个小时。注意： 动词不定式结构也可以直接置于句首担任句子主语，但在现代英语中，这种结构用得不多。【精典例句】To train yourself before the walk is necessary. 在行走活动前训练自己是有必要的。To clean the parks before National Day is important. 在国庆节前，清扫公园是重要的。Key:1. have support teams 2. learn team spirit 3. join the charity walk 4. group people into a team of four 5.
8、finish the walk within 48 hours II. 1. to raise money to help people in need 2. about 48 hours to finish walking the 100-kilometre trail3. to keep our classroom clean and tidy4. to finish the work in 24 hours 5. to donate money to charitiesIt is + 形容词 + for + . + 动词不定式【一语击破】 在一般情况下，用作主语的动词不定式结构的逻辑主语
9、通常可以在特定的上下文或情境中看出。但是在该结构中，动词不定式结构的逻辑主语就是for后面的人或物。for sb. to do sth.通常被称作动词不定式复合结构。【精典例句】It is impossible for us to finish the work in an hour. 要我们一小时内完成工作是不可能的。It is necessary for them to support and help each other both before and during the event. 他们在活动前或活动中互相支持、互相帮助是很有必要的。【巩固精练】 I 用“It is + 形容词
10、+ for + . + 动词不定式”句型连词成句。1. useful, students, take notes in class. _ 2. dangerous, children, climb rocks. _ 3. impossible, them, finish the work in two days. _ 4. important, us, protect our environment. _ 5. impolite, you, talk to your mother in such a rude manner. _ II. 根据汉语意思完成下列句子。1. 我们把英语学好是很重要的
11、。It is important _.2. 中国学生读这些书是不容易的。It is not easy _3. 学生每天准时到校是必要的。It is necessary _.4. 当你出去远足带幅地图是重要的。It is important _.Key:I. 1. It is useful for students to take notes in class. 2. It is dangerous for children to climb rocks. 3. It is impossible for them to finish the work in two days. 4. It is important for us to protect our environment. 5. It is impolite for you to talk to your mother in such a rude manner. II. 1. for us to learn English well 2. for Chinese students to read the books3. for students to come to school on time every day 4. for you to take a map when you go hiking- 3 -
