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did和does的用法
"Did" 和 "does" 是英语中助动词(auxiliary verbs)的形式,用于构成一般过去时和一般现在时的疑问句、否定句,以及强调句。下面分别介绍它们的用法:
"Did" 的用法: 1. 一般过去时:
肯定句: He did his homework yesterday. 他昨天做了他的家庭作业。
否定句: He did not (didn't) do his homework yesterday. 他昨天没有做家庭作业。
疑问句: Did he do his homework yesterday? 他昨天做了家庭作业吗? 2. 强调句:
例句: I did finish the project on time. 我确实及时完成了这个项目。
"Does" 的用法: 1. 一般现在时:
肯定句: She does her homework every day. 她每天做她的家庭作业。
否定句: She does not (doesn't) do her homework every day. 她每天不做家庭作业。
疑问句: Does she do her homework every day? 她每天做家庭作业吗? 2. 强调句:
例句: She does love playing the piano. 她确实喜欢弹钢琴。
总体来说,"did" 用于过去时,而 "does" 用于现在时。在否定句和疑问句中,它们都
充当助动词。在强调句中,它们用于强调某个动作或状态的肯定性。
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