
求职指导郭老师为您分享以下优质知识
be动词的否定形式用于表示主语的否定状态,其基本结构为:
主语 + be动词(am/is/are/was/were) + not
例如:
The cat is not sleeping.(猫不在睡觉)
They were not at the party last night.(他们昨晚没在派对上)
补充说明:
- 第一人称单数:
am not
- 第二人称单数/复数:isn't
- 第三人称单数:isn't
- 第二人称复数/第一人称/第三人称复数:aren't
- 第一人称/第三人称复数:weren't
- 过去时态:wasn't/weren't
否定句的构成规则
- 在be动词后直接加not,例如:
- The book is on the table. → The book is not on the table.
- 缩写形式为:
- am not → aren't
- is not → isn't
- are not → aren't
- was not → wasn't
- were not → weren't
注意事项
- 若be动词为情态动词(如can, must)或助动词(如do, did),则需用"do/does/did not"构成否定,例如:
- You must not smoke. → You must not smoke.
- 疑问句需将be动词提前,例如:
- Is she a teacher? → Is she not a teacher?
通过以上规则,be动词的否定形式可灵活应用于不同语境中,需根据主语和时态选择正确形式。