Question

一道英语题，急急急，万分火急！！在线等！！！

My aunt is busy,she has to look after her baby.It's only three months old.为什么用“it”？

Answer 1

it是指代 前面的her baby.因为小孩较小可不太区分性别所以有此用法.
注意第5点

简简单单一个代词IT真是神通广大，用途多多，其功力比其他任何代词都庞大。

从中文立场看，好些无主语的句子，在译成英文时，都非请IT协助不可。例如：
①是这样！（That's it!）
②没办法。（It can't be helped.）
③轮到我了。（It is my turn.）
④事实上，我们可以打败他们。（As it is, we can beat them.）
⑤离开这里不远。（It is not far from here.）
⑥只要一块钱。（It is only one dollar.）
⑦这儿真热。（It is so hot here!）

此外，“it”还有下列五种用法：

⒈代替上文提到的事物或情况，如：
Look up the word in the dictionary if it is difficult to you.
I would appreciate it if you could do me a favour.

⒉代替没生命的东西，如：
Here is a plastic box. It is useful.
Don't throw the old newspaper away; you may need it.

⒊代替普通动物，如：
The dog outside belongs to the owner of the house. It is very fierce.
Look at the cat! Isn't it furry?

指大动物，如马、大象等或指人们心爱的宠物，如猫、狗等时，可用“he”或“she”，而不用“it”；故事中的动物便是个例子，如：
When the children saw a horse coming, they stopped and looked at him.
A cow is grazing grass in the field. She looks very strong.

⒋用来指天气、日期、季节、时刻、距离等，如：
It is raining outside. Don't go out!
� It is the 20th of December.
� Time flies! It is vacation again.
� It was half past five when Jason got up.
� It is very far from the school to the market.
� It is only a short distance to the library.

⒌可以指性别不详的婴儿，及已知的事实，如：
� The baby next door kept me awake. It cried loudly.
� Yes, I was at home last night. What about it?
� When the company closes down, it (i.e. this event) will affect some staff's future.

⒍可以用来强调句子的某部分，如：
� I respect David. It is he that has made the department what it is now. （强调主语）
� It is Mandarin that Janet has failed to pick up. (强调宾语)
� It is only recently that she has embarked on the learning of Mandarin.（强调副词“recently”）

从上述例子看，代词IT的功用，不仅在代替单数的事物和动物等，还可以协助强调句子成分以及在中英翻译中协助中文无主句的英译。

Answer 2

it 就是"它"啊,不能没有主语吧

Answer 3

因为前一句有出现her baby了,再在下一句出现就显得烦琐,所以就用it代了

Answer 4

这里的it 是做代词用的！因为前面已经提到了这件事！所以后面没有必要再重复一下！因此用it代替前面说过的事情！

Answer 5

it是主语

Answer 6

根据it前面的"three years old"可以知道绝对不是说前面所说的事情，应该是说her baby吧，英语中偶尔也会出现用it 代指人的情况，会出现在口语中