4、物或人,例如:Thisisapenandthatisapencil.Wearebusythesedays.Inthosedaystheworkershadahardtime.2.有时that和those指前面讲到过的事物,this和these则是指下面将要讲到的事物,例如: Ihadacold.That'swhyIdidn'tcome.WhatIwanttosayisthis;pronunciationisveryimportantinlearningEnglish.3.有时为了避免重复提到的名词,常可用that或those代替,例如: Televisi