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may not + verb
表示禁止，语气较强。
You may not park here.
你不得在此停车。
不可以
先理解核心含义，再看它在真实句子里的用法。
不可以
You may not park here.
你不得在此停车。
Prepare the learner guide for this word
可生成：学习解释 Learner guide。只有点击后才会开始生成。
You may not park here between 8 a.m. and 6 p.m.
上午8点到下午6点之间，你不可以在这里停车。
Students may not leave the classroom during the quiz.
测验期间，学生不可以离开教室。
Visitors may not feed the animals in the zoo.
游客不可以在动物园里喂动物。
表示禁止，语气较强。
You may not park here.
你不得在此停车。
表示可能性，推测某事不成立。
This may not be true.
这可能不是真的。
表示对过去某情况的不确定推测。
She may not have seen the message.
她可能没有看到那条信息。
Not this
She may not speak English.
Use this
She cannot speak English.
may not表示不允许或可能性，不表示能力不足。表示能力缺失要用cannot。
Not this
May not I come in?
Use this
May I not come in?
否定疑问句中not应放在主语之后，而非情态动词之前。询问“不可以吗”应用May I not...？
Choose the next layer that will help you use may not with more confidence.
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Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
Use may not naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
may not 表示'不可以'，用于否定许可或可能性。
Dictionary facts from BridgeDict normalized sources.