that is a pen /that is the pen有什么区别?
问题描述：
that is a pen /that is the pen有什么区别?
答
that和this都是指示代词,that is a pen翻译为那是一支笔.a是泛指 不具体指哪一个.
that is the pen翻译为那就是（正是）那支笔.感觉到区别了吗?the是特指,有具体而又特定的指代.