Unit 5 Save the endangered animals第 3 课时——语法课后拓展课时精讲栏目导航课时过关单元语法讲解: 1.It is+ adj.+for sb.(n. 名词/pron. 代词)to do sth. It is+形容词+for+名词/代词+to do sth. =To do sth. +is +形容词+for+名词/代词,意为“做某事对于某人……”。 这里的形容词用来描述事物,常见的此类形容词有:difficult,convenient,important,impossible,possible,necessary,easy,hard 等。如: It’s difficult to fall asleep.= To fall asleep is difficult. 很难入睡。 It’s impossible to find the lost boy.= To find the lost boy is impossible. 找到丢失的男孩是不可能的。 It’s important to speak English as much as possible. =To speak English as much as possible is important. 尽量多说英语很重要。 2.It is+ adj. +of sb.(n. 名词/pron. 代词)to do sth. It is+形容词+of+名词/代词+to do sth.=名词/代词+be+形容词+to do sth. 意为“做某事对于某人……”。这里的形容词用来描述不定式行为者的品质、特点等,常见的此类形容词有:nice,kind,polite,rude,clever,good,foolish,wise,wrong,cruel 等。如: It’s kind of you to help me.= You are kind to help me. 你帮助我真的太友善了。 It’s foolish of you to believe him.= You are foolish to believe him. 你相信他的话真的是太傻了。 【拓展】for 与 of 的辨别方法: (1)当句中的形容词用来说明人的性格或品质时,我们选用介词 of,并且此时的句型可以转换为: It is very clever of you to go with us. = You are very clever to go with us. 你和我们都是聪明的。 (2)当句中的形容词用来说明不定式时,我们选用介词 for。 It is very important for us to learn English. = To learn English is very important for us. 学英语对我们很重要。 3.adj. +enough+to do sth. adj. +enough+to do sth. 意为 “足以……去做某事”。 enough 是副词,修饰前面的形容词,表示程度,enough 后面的动词不定式表示结果。如: The boy is tall enough to reach the book on the shelf. 这个男孩足够高,能够得着架子上的书。 The...