指示代词(this,that,these,those)在句中可作主语、宾语、表语、定语：
This is yours and that is mine.这是你的，那是我的`。
I want this book, not that book.我要这本书，不是那本书。
I like these and he likes those.我喜欢这些，他喜欢那些。
These computers are cheap.这些电脑便宜些。
What I want to say is this.我想说的就是这点。
