那个that,thisthat

man who is that 那个男人是谁 he's my father he's teacher.
woman who is that 那个女人是谁 she s my mother.
that是什么词性
thisthat em>这个/em em>那个/em>
who's that girl 那个女孩是谁 girl she's 她是萨拉 sarah.