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could
01
能, 可以
used as the past tense of ‘can’
Example
When I was younger, I could run faster.
我年轻时能跑得更快。
Yesterday, I could see the stars clearly in the night sky.
昨天，我能清楚地看到夜空中的星星。
02
能否, 可以
used to ask if one can do something
Transitive
Example
Could you please pass me the salt?
能否请你把盐递给我？
Could you help me with my homework?
能否帮我做作业？
03
能够, 可以
used to show the possibility of something happening or being the case
Transitive
04
可以, 能够
used to present an offer or recommendation
Transitive
