This,that,these,those可以在句子中做主语、表语、宾语、或定语。Thatis a good idea.
This和that有时句子中还可以做状语,表示“到如此的程度”的意思,此时他们均用作副词Thesnow was about this deep.
Such指这样的人或事,在句子中作主语、定语或宾语Suchwas the story.
Same指同样的人或事,在句子中作主语、表语、宾语或定语,same的前面要用定冠词theThesame can be said of the other article.