英语中我想知道that是不是用来特指?that is the pen .有木有问题?

Is that your pen on the desk? That is green pen that is a pen That is your pen that is your pen. that is a pen /that is the pen有什么区别? 英语改错 This is the very pen that you give it to me 英语中关于省略的问题i like the way that is used by many people 这里的that Is that Mary's pen? 定语从句中先行词有表示特指的the,关联词只用that吗 The pen is cheaper than that one.（同义改写） The pen is not as expensive as that one.