It-is--+形容词+enough-to-和too-……to的用法(4页).doc

-一、二、三、 It-is-+形容词+enough-to-和too-to的用法-第 4 页四、 enough to的用法1.enough意思是“充分地，足够”，放在名词之前，形容词、副词之后。例：他跑得不够快。He didnt run fast enough. 没有足够的食物。There are not enough food.【拓展】enough做名词，为“足够，充分”。例：I have eaten enough,Thank you. 我已经吃饱了，谢谢。2. “主语be动词形容词+enough +to do” “主语行为动词副词+enough +to do”描述一个人的品质和能力，表示“某人足够去做某事”。He is tall enough to reach the box. 他足够高可以够到盒子。 He runs quickly enough to win the race. 他跑足够快，赢得了比赛。3.如果强调“对某人来说足够”，则把 “for sb.”用在动词不定式之前。 The book is easy enough for you to read. 二、 too to的是“太而不能”1、 “主语be动词too形容词 +to do” “主语行为动词too副词+to do”，表示否定的结果。例: He is too poor to buy a new coat. 他太穷了不能买一件新衣服。 He studies too carelessly to get high marks. 他学习太粗心了，不能得高分。2.用“too+形容词/副词for sb. to do ”表示“对某人来说太而不能”This story is too difficult for me to understand. 这个故事太难，我不能理解。3.当too前面有否定词比如never, not, nothing等时，句子表示肯定。例：Youre never too old to learn. 活到老，学到老。注意：当动词不定式和句子的主语存在逻辑上的动宾关系时，不定式的动词要使用及物动词或不及物动词加介词。The room is big enough to live in.The pen is too small to write with.4.too to可以和enough to do和 so that 转换too to 和enough to do 转换时， enough 前面的形容词和too前面的形容词要互为反义词She is too young to do the work .= She isnt old enough to do the work.enough to 和so that 转换时，注意that 后面要用肯定句。He is tall enough to reach the box. = He is so tall that he can reach the the box.He runs quickly enough to win the race. = He runs so quickly that he can win the racetoo to 和 so that转换时，that 后面用否定句。She is too young to do the work. = She is so young that she cant do the work.5. too还有“太、非常”的意思当too后面跟 happy, glad, sad等表示感情的单词时too to 表示肯定意义He is too sad to hear the bad news. 听到这个不好的消息他太悲伤了。She is too willing to be a dancer. 她太想成为一个舞蹈家了。当too前面有 only， all，but时，too to 表示肯定意义I am only too happy to help you. 我非常开心去帮助你。