Auxiliary verb

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Also known as: modal verb, 助动词 (zhùdòngcí), 情态动词 (qíngtài dòngcí) and 能愿动词 (néngyuàn dòngcí).

Auxiliary verbs are helping verbs that are used in conjunction with main verbs to express the tense or mood of the verb. In English, these are things like "should", "will" and "can", which all change something about the situation. Auxiliary verbs express capability, possibility, necessity, obligation or willingness.

Characteristics

In sentences with auxiliary verbs, the auxiliary verb is the one that gets modified. That is, if you want to negate a sentence with an auxiliary verb, put "不" before the auxiliary, not the main verb. Also, unlike normal verbs, auxiliary verbs can't be reduplicated, nor can they take the aspect particles: 了, 着, and 过. Finally, when you are responding to a question that uses an auxiliary verb, you reply with the auxiliary verb, not with the main verb that it modifies.


Grammar Patterns for Auxiliary Verbs

Sources and further reading