You use those to refer to people or things which have already been mentioned.
Witnesses said that two people were killed, but those accounts could not be confirmed.
目击者说两人遇害,但那些说法都没法得到证实。
You use those when you are referring to people or things that are a distance away from you in position or time, especially when you indicate or point to them.
What are those buildings?
那些建筑物是什么?
You use those to refer to someone or something when you are going to give details or information about them.
Those people who took up weapons to defend themselves are political prisoners.
那些拿起武器自卫的人是些政治犯。
You use those when you refer to things that you expect the person you are talking to to know about or when you are checking that you are both thinking of the same people or things.
He did buy me those daffodils a week or so ago.
他确实在大约一周前给我买了那些水仙花。
You use those to refer to people or things which have already been mentioned.
I understand that there are a number of projects going on. Could you tell us a little bit about those?
我知道有一些项目正在进行之中。你能给我们简单说说那些项目吗?
You use those when you are referring to people or things that are a distance away from you in position or time, especially when you indicate or point to them.
I like these but not those.
我喜欢这些,而不是那些。
Those are nice shoes. Where'd you get them?
那些鞋子很不错。你在哪儿买的?
You use those to introduce more information about something already mentioned, instead of repeating the noun which refers to it.
The interests he is most likely to enjoy will be those which enable him to show off himself or his talents.
他最有可能感兴趣的,是那些能让他自我炫耀或卖弄才华的事情。
You use those to mean 'people'.
A little selfish behaviour is unlikely to cause real damage to those around us.
有点儿自私的行为不太可能对我们周围的人们造成真正的伤害。