it的形容詞性物主代詞和名詞性物主代詞

　　It's about this high.

　　大約有這么高。

　　There have been some problems but basically it's a good system.

　　雖然出現過一些問題，但這基本上仍不失為一個好系統。

　　It's been quite a day, one way and another.

　　從幾方面看，這是不尋常的一天。

　　It's good to meet people from different parts of the country.

　　結識來自這個國家不同地區的人是有益的。

　　It's only human to want the best for your children.

　　為自己的孩子謀求最好的條件是人之常情。