I can let him (have) a room为什么不能用has
have和has在用于英语表达动词“有”的含义时，前者使用于第一人称、第二人称和各人称复数，has用于第三人称单数,同时它们也作为完成时态的助动词存在，其用法和做实义动词“有”的规则也是一样的.
助动词have的用法
1）have +过去分词，构成完成时态，例如：
He has left for London. 他已去了伦敦。
By the end of last month, they had finished half of their work.
上月未为止，他们已经完成工作的一半。
2）have + been +现在分词，构成完成进行时，例如：
I have been studying English for ten years.
我一直在学英语，已达十年之久。
3）have+been +过去分词，构成完成式被动语态，例如：
English has been taught in China for many years.中国教英语已经多年。
动词have/has表示"有"时,它通常有三个含义:
A.表示"某人(在物质上的)所有."这种情况下不能用there be替换.如:
I have a new watch. 我有一块新表.
He has a good friend. 他有一个好朋友.
B.表示"某人或动物(在身体上的)长有".这种情况也不能用there be替换.
如:
She has blue eyes. 她的眼睛是蓝色的.
A horse has two ears. 马有两只耳朵.
C.表示"某物体(在结构上的)装有".这种情况可以用there be替换.如:
A clock has a round face.= There is a round face on a clock.
钟上装有一个圆型的钟盘.
That room has only two windows.= There are two windows in that room.
那个房间仅装有两扇窗户.
The school has 14 classes. = There are 14 classes in the school.
那个学校有14个班级.
D.另外,表示"某人手中有某物"时,也用have/has.例如:
Mary has a glass of water in her hand. 玛丽手中端着一玻璃杯水.
1.使役动词是表示使、令、让、帮、叫等意义的不完全及物动词,主要有make(使,令), let(让), help(帮助), have(叫)等。
2.使役动词后接受词,再接原形不定词作受词补语。
接宾语时，人称代词用宾格。
He made me(宾格) laugh.
他使我发笑。
I let him go.
我让他走开。
I helped him repair the car.
我帮他修理汽车。
Please have him come here.
请叫他到这里来。
3.使役动词还可以接过去分词作受词补语。
I have my hair cut every month.
我每个月理发。
4.使役动词的被动语态的受词补语用不定词,不用原形不定词。
(主)He made me laugh.
他使我笑了。
(被)I was made to laugh by him.
我被他逗笑了。
使役动词有以下用法：
a. have somebody do sth让某人去做某事
I had him arrange for a car.
b. have somebody doing sth.让某人持续做某事。
He had us laughing all through lunch.
注意：用于否定名时，表示“允许”
i won't have you running around in the house.
我不允许你在家里到处乱跑。
********
小议“使役动词”的用法
1. have sb do 让某人干某事
e.g:What would you have me do?
have sb/sth doing 让某人或某事处于某种状态，听任
e.g: I won't have women working in our company.
The two cheats had the light burning all night long.
have sth done 让别人干某事，遭受到
e.g:you 'd better have your teeth pulled out.
He had his pocket picked.
notes: "done"这个动作不是主语发出来的。
2.make sb do sth 让某人干某事
e.g:They made me repeat the story.
What makes the grass grow?
notes: I was made to repeat the story.
make sb/sth done/adj./n
e.g. The news made him happy.
He couldn't make himself heard above the noise of the traffic.
His actions made him universally respected.
He made her his wife.
3.get sb to do 使某人干某事
e.g: I can't get anyone to do the work properly.
get sth done 让别人干某事
e.g: I must get my hair cut.
Can you get the work finished in time?
4.leave sb to do sth 让某人干某事
e.g: We left him to paint the gate.
I'll leave you to settle all the business.
leave sb doing 让继续处于某种状态
e.g: Don't leave her waiting outside in the rain.
We left him painting the gate.
leave sth done/adj./prep.phrase
e.g:Please excuse me if I have left any of your questions unanswered.
His illness has left him weak.
I was left with a ray of hope.
********
使役性动词（Causative Verb）
1.make /have/ let +sb +do sth.
2.get/set/leave + sb to do/doing sth.
let 后面肯定要用动词原形嘛
have在此是不带to的不定式，
let sb do sth让某人做某事
因为let是使役动词，用法let somebody do sth。
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