this

这, 这个

这事, 这人

下述(或上述的事情)

这里, 这时

后者(前者用that)(常有承上启下的作用, 而that一般只能承上)

this

used preceding a noun referring to something or someone that is closer: distinct from that.(as pronoun)

used preceding a noun that has just been mentioned or is understood.(as pronoun)

used to refer to something about to be said, read, etc.(as pronoun)

the present or immediate.(as pronoun)

often used in storytelling, an emphatic form of aoften used in storytelling, an emphatic form of the

used with adjectives and adverbs to specify a precise degree that is about to be mentioned