chapter 5 短语语法单。
一。it is +adj. +for sb. to do sth.
这个句型意为“对于某人来说做某事是。。。相当于“to do sth is +adj. +for sb.
”在该句型中，it 作形式主语，to do sth. 为真正的主语，形容词用来描述不定式所表述的事件。这类形容词常见的有：
easy, difficult ,convenient , important , impossible , necessary等。
例子： it’s necessary for us to learn english well .=to learn english well is necessary for us .
it’s impossible for you to run 10.000meters= to run 10000 meters is impossible for you .
二….+adj. +enough to do sth.
这个句型意为“……足够…….而可以做某事”。not…enough to do sth .
常可与too..to do sth. 互换，也可以so …that …句型互换。
例子：the man is strong enough to lift the stone .
my sister is clever enough to come up with a good idea.
the man is not strong enough to lift the stone .=the man is too weak to lift the stone .=the man is so weak that he can’t lift the stone.
my sister didn’t walk fast enough to catch the bus .=my sister did walked too slowly to catch the bus =my sister walked so slowly that she didn’t catch the bus .
三。it is + adj. +of sb. to do sth.
这个句型意为”（某人）做某事，某人是…….相当于”sb. is +adj.
+to do sth. ”在这个句型中，同第一个句型一样， it作形式主语，to do sth.为真正的主语，但形容词用来描述的是of 后面的逻辑主语的性格和品质。
这类形容词常见的有：careful , generous , good , polite , wrong , rude , wise br**e , silly 等。
例子：it’s kind of you to lend me so much money . it’s silly of you to do such a bad thing .
四。 以-ing 和-ed 结尾的形容词。
以-ing 结尾的由动词变化而来的形容词一般修饰物，意为“令人…….的“；而以-ed 结尾的由动词变化而来的形容词一般修饰人，意为”感到…….的“。
常见的这类形容词有：annoying /annoyed boring. bored disappointing / disappointed tiring /tired interesting /interested exciting /excited relaxing /relaxed surprising /surprised frightening /frightened
jane is bored because her job is boring .
the film was disappointing .we were disappointed with it .
五。形容词作宾语补足语，对宾语起补充说明作用。形容词作宾语补足语时，常与动词find ,want ,keep ,make , think 等词连用。
例子：she found her new job boring . the cook tried to keep the fish fresh .
练习：一。填空：
1 .it’s very kindfor/of you) to help me .
2. it’s cleverfor /of )you to work out the maths problem.
3. it’s very dangerousfor /of )children to cross the busy street.
4. it’s difficultfor/of us） to finish the work on time.
5. -this is the mostfilm i’ve ever seen.
---i think so. i’m really about it .(bore )
6yourself .holly .don’t push yourself too much.
---yes ,i know .i’ll listen to some music to gettonight .(relax)
7. the book is veryare youinterest) in it ?
8. the result of his exam wasbut he tried his best not to make his parentsdisappoint).
9. he foundinteresting to skate on real ice .
10. thenews that our team beat class five us very much .（amaze）.
二。单项选择题。
)1generousthe little girl to share her toys with the other kids .
a. it’s ; of b. that’s ; of c . it’s ; for d. that’s ; for
)2. we think it is difficultthemthe charity walk without team spirit .
a. for; to finish b . of ; to finish c. for ; finishing d. of; finishing
)3. it’s very kind you .thank you for your help.
a. of b. for c. to d. on
)4. -thank you for your good service.
---you are welcome .it is patientus to serve everyone .
a. of b. for c. to d. with
) nice andyme with my english study .
a. at; to help b. of; to help c. with; help d. of ;help
)6. is necessary for us every day .
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