1
can't do sth
表示能力不足或客观不可能。
I can't swim.
我不会游泳。
不能；无法
先理解核心含义，再看它在真实句子里的用法。
不能；无法
Cannot; be unable to do something.
I can't swim.
我不会游泳。
不能(否定助动词)；无法；没有能力(因缺乏力量、技能、知识或物资,或因逻辑不可能等)。
Cannot (negative auxiliary); be unable to; not have the ability to (whether due to lacking relevant strength or skill or knowledge or supplies, or due to logical impossibility, etc).
被禁止；不被允许。
To be forbidden to; to be not permitted to.
I can't swim.
我不会游泳。
I can't come to the party tonight.
我今晚不能来参加聚会。
You can't park here.
你不能在这里停车。
表示能力不足或客观不可能。
I can't swim.
我不会游泳。
表示对某状态的强烈否定推测。
This can't be true.
这不可能是真的。
表示无法控制某个动作。
She can't help laughing.
她忍不住笑起来。
Not this
I don't can swim.
Use this
I can't swim.
英语中，情态动词的否定形式是在情态动词后加 not，而不是借助助动词 do。中文的“不能”常被直译为“don't can”，这是错误的。
Not this
I can't go yesterday.
Use this
I couldn't go yesterday.
“can't”是现在时，表示现在的不能；过去时的不能要用“couldn't”。中文“不能”没有时态变化，导致学习者误用现在时表达过去。
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Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
Use can't naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
情态动词否定缩略形式，后接动词原形
Collins 词频等级为 5，建议结合例句记忆，而不是只背中文释义。
Dictionary facts from ECDICT, WIKTIONARY.