15楼说的不对,11楼是对的,再看下面字典里对this的一条解释
used to refer to something that you are going to say or that is just about to happen:
Now, listen to this.
Wait till you hear this joke.
This is going to surprise you.

13楼是对的

回复：17楼
就是因为它是近指的，所以才会用在这种情况下。

回复：10楼
other作为代词时,others就表示复数: 余下的人/物

感谢 大家的帮助