指示代词分单数(this / that)和复数(these / those)两种形式,既可作限定词又可做代词,例如:单数复数限定词:This girl is Mary. Those men are my teachers.代词:　This is Mary.　 Those are my teachers.分为指人与指物.指示代词在句子中可充当主语、宾语、表语、定语。主语This is the way to do it.　 这事儿就该这样做。宾语I like this better than that.　 我喜欢这个多于那个。介词宾语I don't say no to that. 　 我并未拒绝那个。There is no fear of that.　 那并不可怕。表语My point is this.　我的观点就是如此。定语This room is mine. 这间房间是我的。this和these指在时间或空间上较近的人或者事物,that和those指在时间或空间上较远的人或者事物。例如:This is a pen and that’s an eraser. 这是一支笔,那是块橡皮擦。This is a boy and those are girls. 这是个男孩,那些是女孩。