- [指无生命的东西、动物、植物]它；这；那：
It is a table.
这是一张桌子。
Is this the peony? No,it is the tree-peony.
这是芍药吗?不，这是牡丹。
He took a stone and threw it.
他拾起一块石头，把它扔了出去。
- [指已提到或将提及的事物、活动、经验、抽象观念等]：
Although he didn't like it, I decided to see the movie anyway.
尽管他不喜欢这部电影，我还是决定去看一看。
I remembered he told me about it.
我记得他跟我提过这件事。
It all started with Adam and Eve.
这种想法从亚当和夏娃以来就开始了。
- [在不分性别或情况不详时指]：
Who is it? It's me.
谁呀?是我。
- [作无人称动词的主语，表示天气、时日、距离、状态、温度等等]：
It rains.
下雨了。
It is 5 o' clock in the afternoon.
现在是下午5点钟。
It is a long way to the sea.
这离海很远。
- [作先行代词，引导作为逻辑主语或宾语的从句]：
It is certain that we shall succeed.
我们一定会成功的。
It is no use trying.
试也无用。
- [作先代词，用以构成强调句型]：
It was here that I first met him.
这就是我与他初次见面的地方。
It is I that am fortunate.
这幸运的是我。
- [口语中作某些动词或前置词的含糊的宾语，用以构成习语]：
to fight it out
战斗到底
to get with it
振作精神
- [用在临时用作动词的词之后，用以构成习语]：
to lord it over others
对人称王称霸
- [口语中作表语，指绝妙的人或物；理想的东西；登峰造极]：
In a lilac sun bonnet she was it.
她戴着一顶浅紫色遮阳帽，真是漂亮极了。
The steak was really it.
这牛排棒极了。
For barefaced lying you are really it.
就无耻造谣之本事而论，你真算得上天下第一。
- [加于主语名词后，起重复作用，常见于诗歌或非规范语]：
The horse it ran away.
那匹马呀，跑掉了。
- [对幼儿用语，你]：
Did it hurt its little hand?
小乖乖手碰疼了没有?