Word · CEFR A1 · Frequency #55
could
can的条件式
- 1.
conditional of can
can的条件式
In use
I could read before I started school.
Could you speak a little more slowly?
The delay could cause more problems.
could + 动词原形 (过去能力)
He could run fast when he was young.
他年轻时能跑得很快。
Could + 主语 + 动词原形? (礼貌请求)
用 could 比 can 更委婉礼貌。
Could you help me with this box?
你能帮我搬这个箱子吗？
could + 动词原形 (可能性)
It could rain later.
待会可能下雨。
Verb forms
base could · third person could · -ing · past could · past participle undefined
情态动词 could 没有 -ing 形式或过去分词，也不使用普通的第三人称单数 -s 变化。
Common mistakes
I could swim very fast now.I can swim very fast now.
could 表示过去的能力或委婉语气，不能用于陈述现在的能力，现在能力应用 can。
If I had more time, I would go to the party.If I had more time, I could go to the party.
在虚拟条件句中，would 表示意愿，could 表示可能性或能力；这里表示‘可能去’，应使用 could。
Connections
Collocations
- could be
- 可能是
- It could be a mistake.这可能是个错误。
- could have
- 本来可以
- I could have helped you.我本来可以帮你的。
- could not
- 不能；无法
- I could not believe my eyes.我无法相信自己的眼睛。
- could you
- 你能……吗
- Could you open the window?你能打开窗户吗？
- could I
- 我可以……吗
- Could I have your name?我可以知道你的名字吗？
- could it
- 它可能
- Could it be true?
Learner notes
Memory Tip
将 could 中的 o 想象成时间环，代表过去的时间，帮助记住它是 can 的过去式。
Context & Register
register: mixed; contexts: 礼貌请求、过去的能力、可能性; note_zh: “could”多用于礼貌请求和可能性表达，语气较委婉。
Grammar Note
could 后接不带 to 的动词原形；它既可作 can 的过去式，也可独立表达委婉或较弱的可能性。
Pronunciation & Spelling
All these words rhyme with 'could' (/kʊd/): they all have the same stressed vowel /ʊ/ and ending /d/.
High-value vocabulary
该词属于 Oxford 核心词汇，值得优先掌握常见搭配和句型。
Usage priority
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 BRIDGEDICT_CURATED_MODAL, CEFR_J.