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　　Auxiliary Verbs

　　助动词

　　You already know that verbs express action or state of being. You also know that verbs have tense, mood, and voice.

　　动词可以描述行为和状态，有时态、式和语态。

　　Sometimes, to produce the various tenses, moods, and voices of verbs, you must use auxiliary verbs, or "helping" verbs. Remember that verbs only have five forms, so the auxiliary verbs or "helping" verbs allow us to form all of the various tense, moods, and voices.

　　有时，想要使用动词的更多时态、式和语态，需要使用助动词。切记，动词只有五种形式，而住动词可以形成所有不同的时、态、式。

　　助动词怎样体现时态和语态的：

　　Auxiliary verbs are used to form the perfect tenses and the future tense.

　　助动词可以表达完成时和将来时。

　　Auxiliary verbs are used to form the subjective mood, and can help to add emphasis with the imperative or indicative moods.

　　助动词可以形成虚拟语气，在祈使语气和陈述语气中表强调。

　　How auxiliary verbs help with voice:

　　助动词怎样体现语态：

　　Auxiliary verbs are used to form the passive voice.

　　助动词可以形成被动语态。

　　哪些词时助动词：

　　“Be”的所有形式：am is are was were

　　“Have”的所有形式：have has had

　　“Do”的所有形式：do did

　　其他词：can could shall should will would may might must