练习：重复2.3、2.4、2.5 各节练习题的时态表，这次用红色标出限定动词 2.8 语气（voice） 表2.2 是主动语气（active voice）的时态表；主动语气是说当作主词的人或物主 动地做了一个动作。
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“我们正组织一个委员会来调查这些令人遗憾的事故，以便确定它们发生的原因，以避免它们今后再重复”是企业的推诿说法，但它在语法上是主动语气。
"We are forming a committee to investigate these regrettable incidents in order to ascertain their cause so as to avoid them in the future" is weaselly corporate-speak, but it is grammatically active.
写作语调：你是不是做到了亲善友好、积极主动、平等对话式的语气？
Writing Intonation: Do you write in a friendly, proactive, equality conversational tone?
一类动词，如有，可以，或将，在句中伴随主动词，起到帮助区分语气，语态，体及时态。
A verb, such as have, can, or will, that accompanies the main verb in a clause and helps to make distinctions in mood, voice, aspect, and tense.
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