“现在简单时：to be” （am / is / are）

• 中文很多时候不需要「是」，但英文句子里少了 be 动词（am/is/are）就不完整，这是英语最基础也最重要的动词之一。
• 肯定句按主语变化：I am、you/we/they are、he/she/it is，口语几乎都用缩写（I'm、you're、he's）。
• 否定句直接在 be 动词后加 not，可以缩写成两种形式（isn't 或 's not）；疑问句把 be 动词移到主语前面。
• 简答有个反直觉的规则：肯定简答不能缩写（要说 Yes, I am，不能说 Yes, I'm），但否定简答可以。

重点内容

基本变化表

缩写形式（口语常用）

肯定缩写：

• I am → I'm
• You are → You're
• He is → He's
• She is → She's
• We are → We're
• They are → They're

否定缩写（两种方式）：

• She is not → She's not 或 She isn't
• We are not → We're not 或 We aren't

⚠️ I'm not → 只有这一种形式（"I amn't" 不存在）

否定句

直接在 am/is/are 后面加 not，可以缩写。

• I am not at work. = I'm not at work. 我不在上班。
• Money is not important. = Money's not important. = Money isn't important.
• They are not at home. = They're not at home. = They aren't at home.

疑问句

把 am/is/are 移到主语前面。

• Are you tired? 你累吗？
• Is she Mexican? 她是墨西哥人吗？
• Are they your children? 他们是你的孩子吗？

简短回答

疑问词疑问句

疑问词（where, when, who, what）放在句首，后面跟 am/is/are。

• Where are you from? I'm from Malaysia. 你从哪里来？
• When is the meeting? It's next Tuesday. 会议什么时候？
• What time is it? It's six o'clock. 现在几点？

例句练习

1. I'm a student at UTAR. My roommate is from Sabah.
   我是 UTAR 的学生，我室友是来自沙巴的。

1. Are you free tonight? No, I'm not. I'm busy.
   你今晚有空吗？没有，我很忙。

1. Is this your bag? Yes, it is.
   这是你的包吗？是的。

1. We're not hungry. We ate before we came.
   我们不饿，我们来之前吃过了。

1. Where is the nearest LRT station?
   最近的 LRT 站在哪里？

常见错误

Sources

Blog / Website：

1. Present simple: 'to be' – British Council LearnEnglish