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one与thatworryingly,it'softenveryhardtoshakeoffthehabitsonepicksupwhenyoung.这里的one为什么不能换成that或what这句话that不作代词作从句怎么表达

题目详情
one 与that
worryingly,it's often very hard to shake off the habits one picks up when young.
这里的one为什么不能换成that或what
这句话that不作代词作从句怎么表达
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答案和解析
这里的one 代指补确定的某人呀,怎么能用that /what
令人烦恼的是,一个人很难戒除年轻时染上的习惯.
另外更多区别供你参考:
“this”、“that”既可以作形容词,又可以作指示代词;而“it”只能作代词.one可用数词又可作代词.
指“物”
1.“this”指近物,“that”指远物,“it”没有远近之分.如:
This is a computer.这是一台电脑.(在近处)
That is a bike.那是一辆自行车.(在远处)
2.在回答“this”和“that”作主语的疑问句时,常用“it”代替“this”和“that”.如:
-Is this/that a car?这/那是一辆小汽车吗?
-Yes,it is./No,it isn′t.是的,它是./不,它不是.
-What′s this/that?这/那是什么?
-It′s a ruler.这/那是一把尺子.
3.陈述在一起的两样东西时,应先说“this”,后说“that”.如:
This is a book.That is a pen.这是一本书,那是一枝钢笔.
4.one与it的区别
one指代上文提到过的同类事物中的一个,但不是上文提到的那一个事物.如果指同类事物中的一些,要用ones.如:
This apple is small.Please give me a big one.
这个苹果小,请给我一个大的.
These books are mine.Those ones are Lily's.
这些书是我的,那些书是莉莉的.
it指代前文中提到过的那一个事物.如:
My bike is very old,but I like it very much.
我的自行车很旧,但我很喜欢它.
Where is my new pen?I can't find it.
我的新钢笔在哪儿?我找不到它了.
练一练:
1.---This is my dog,Spotty.
---Oh,________is very lovely.
2.I havn't a pen.Do you have_____.
the one 用来代替前面特指的单数名词,有时可用that代替(尤其在有后置定语的情况下.
that=the+单数可数名词/不可数名词 代替前面出现的单数可数名词/不可数名词
the book on the desk is better than /the one under the desk
the populatin of china is larger than that of america.
that常与介词of 一起使用