be动词与not连用时的缩写规则如下：
- am not → isn't
- is not → isn't
- are not → aren't
- was not → wasn't
- were not → weren't
例如：
- I am not a student. → I'm not
- They are not here. → They aren't
- The cat was not sleeping. → The cat wasn't sleeping
注意事项
- am与not不可缩写： - 原因：am是be动词的第一人称单数现在时形式，没有缩写形式。 - 例外：在缩写中，am always followed by is
- 仅be动词的现在时态（am/is/are）可与not缩写，过去时态（was/were）需完整书写。 - 扩展应用：
- 当be动词与助动词（如do/does/did）连用时，需保持原形，例如：
- The dog did not （didn't） bark.
- 不可缩写的情况：
- I am not → I'm not（正确）
- I am not a cat. → I'm not a cat.
- 常见误区：
- 将am与not缩写为 i'm not，实际应为 I'm not
通过以上规则，可确保在书写否定句时保持语法正确性。
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