帮助动词表示需要、可能或愿望的词叫助动词。助动词经常修饰动词或形容词，它的后边不能直接带名词。助动词的否定式是在助动词前边用否定副词"不"。
Verbs that "help" other verbs to express necessity, possibility and willingness are called auxiliary verbs. Auxiliary verbs are often used to modify verbs or adjectives. A noun cannot immediately follow them. They are negated by 不.
助动词有以下几类：
Auxiliary verbs include the following kinds:
- 表示有某种技能、能力的：
Those expressing capability: 能 能够 会 - 表示可能的：
Those expressing possibility: 能 能够 会 可以 可能 - 表示情理上需要的:
Those expressing necessity by reason: 应该 应当 该 要 - 表示必要的：
Those expressing obligation: 必须 得（děi） - 表示主观愿望的：
Those expressing willingness: 要 想 愿意 敢 肯
