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Similarly, you may ask, what is the rule for using that or which?
When referring to objects, though, the rule forusing “that” and “which” correctly issimple: THAT should be used to introduce a restrictiveclause.
Accordingly, what is difference between which and that?
To start with, we use “that” when we referto people, animals, and things. We use “which” when werefer to animals and things. However, the main differencebetween both depends on the clause. If the clause isrestrictive, you need to use the relative pronoun that, without it,the meaning would be unclear.
In that is why, that is a demonstrative pronoun. Inwhich is why, which is a relative pronoun. That in that is why isusually the subject of a sentence or a clause that can stand alone:I want to be involved in town government, and that is why I'mrunning for mayor.