牛津译林版英语八年级下Unit5 Grammar精品导学案
◆自主探究，请带着下面这些问题阅读教材。
1．enough to后接动词的什么形式？
2．too…to…表示什么意思？
教材导读
1．You are old enough to learn about manners．你已经到了学习礼仪的年龄了。
探究点：enough to后接动词什么形式？
[指点迷津] enough to后接动词原形。enough常构成如下句型：
主语＋be＋形容词＋enough＋to do sth.意为“某人／某物够……能……”。
He is tall enough to reach the ball on the shelf.他够高能够到架子上的球。
The classroom is big enough to hold so many students.
这间教室够大能容纳如此多的学生。
[注意] 否定式为“主语＋be not＋形容词＋enough＋to do sth.”，意为“某人／某物（不）够……而（不）能……”。
The man isn't strong enough to carry the bag.
这个人不够强壮拿不动这个包。
你儿子已经到了上学的年龄了。
Your son is_______ _______ _______ go to school.
2. The UK is too far away for Jenny to go there on her own.
英国太远了珍妮不能独自去那里。
探究点：too…to…是什么意思？
[指点迷津] too…to…常构成如下句型：
“主语+be＋too＋形容词＋to do sth．”意为“某人／某物太……而不能……”。
The boy is too young to help you.这个男孩太小而不能帮你。
[注意] (1)有时我们需要在to do sth.的前面加上for someone，此时句中的动词必须为及物动词，若为不及物动词须再加上适当的介词。
The text is too long for us to read.
这篇课文太长我们读不了。(read是及物动词)
The room is too small for us two to live in.
这个房间太小我们两个人住不下。（live是不及物动词）
(2)“too＋形容词＋ to do sth.”可以和“not＋该形容词的反义词＋enough＋to do sth.”的结构转换。
The man is too weak to do the job.
＝The man isn't strong enough to do the job.
这个人太瘦弱而不能做这项工作。
(3) “enough to”和 “too…to…”结构均可以和“so…that…”结构转换。
The doctor is kind enough to help us. ＝The doctor is so kind that he will help us.
这个医生很善良，他会帮助我们。
Lucy is not careful enough to get high marks,
＝Lucy is too careless to get high marks.
＝Lucy is not so careful that she can't get high marks.
露西不够细心，得不到高分。
同义句转换
①The girl is too fat to wear a skirt.
The girl is_______ _______ _______ to wear a skirt.
The girl is_______ _______ _______ _______ _______ wear a skirt.
②Li Lei is hard-working enough to do all kinds of things.
Li Lei is_______ hard-working_______ he_______ do all kinds of things,
3. He could not write down all the main points.他不能写下主要的观点。
探究点：write down的意思是“_______”。
[指点迷津] write down意为“写下，记下”。如宾语是名词时则既可放在down之前又可放在down之后；如果宾语是代词则只能放在write与down之间。
Please write down your names on the paper.
＝Please write your names down on the paper.请才巴你们的名字写在纸上。
Please write it down．请把它写下来。
( )The new words are on the blackboard. Please_______.
A. write it down B. write them down
C. write down them D. write down it
4. Kitty was very busy with her dancing lessons.
探究点：be busy with的意思是“_______”。
[指点迷津] be busy with意为“忙于某事?，可以和be busy doing sth.转换。
They are busy with their homework.
＝They are busy doing their homework.
他们正忙于做功课。
同义句转换
The teacher is busy with our exercises.
The teacher_______ _______ _______ over our exercises.