which

音標(biāo)發(fā)音

which用作疑問(wèn)代詞時(shí),在特殊疑問(wèn)句中用作賓語(yǔ)或主語(yǔ)。
which用作關(guān)系代詞,可引導(dǎo)限制性定語(yǔ)從句或非限制性定語(yǔ)從句,引導(dǎo)非限制性定語(yǔ)從句時(shí)which可以用整個(gè)主句作爲(wèi)其前行詞,相儅於and that,有時(shí)還可引導(dǎo)不定式短語(yǔ)從句。

(QUESTION) (used in questions and structures in which there is a fixed or limited set of answers or possibilities) what one or ones
(ADDS INFORMATION) used to add extra information to a previous clause, in writing usually after a comma
(USED TO REFER) used as the subject or object of a verb to show what thing or things you are referring to, or to add information about the thing just mentioned. It is usually used for things, not people

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You use which to refer to a choice between two or more possible answers or alternatives.
Which is also a conjunction.
You use which at the beginning of a relative clause when specifying the thing that you are talking about. In such clauses, which has the same meaning as that. (that)
You use which to refer back to an idea or situation expressed in a previous sentence or sentences, especially when you want to give your opinion about it.
Which is also a determiner.
If you cannot tell the difference between two things, you can say that you do not know which is which.