温度：It's very hot.
天真热。
天气：It's rainy (windy/snowy)
下雨了/刮风了/下雪了。
1. (指已提及或心目中的人或事物)这,那,它
This is our new car. I bought it yesterday.
这是我们的新车。我昨天买的。
2. (指无生命物、动植物、性别不详的幼孩等)它
What a beautiful baby -- is it a boy?
多漂亮的孩子啊--它是男孩吗?
3. (作无人称动词的主语,表示时间、气候、距离等)
It's about 50 kilometers from here to my ranch.
从这儿到我的牧场约有五十公里。
It's early yet.
还早呢。
It's very hot.
天真热。
4. (置于句首或句中,引导后面的短语或从句)
I'd think it well worth while to go.
我觉得很值得一去。
5. (作为形式上的`主语或宾语,用于表示强调的句型中)
But here it's my word that counts.
但这里是我说的话算数。
6. (用于某些动词、介词后面,词义含糊,构成习惯语)
Don't lord it over your friends.
不要对你的朋友摆威风。