could，英语单词，主要用作动词，主要意思为“可以，能；本该，应该；真想；好像，仿佛”等。

英 [kʊd; kəd] 美 [kʊd; kəd]

v. （礼貌地请求许可）可以，能；（礼貌地请求别人做事）能，能否；（表示可能）可能，也许；（表示未发生的事情）差点就，本能够；（用于提出建议）可以，能；本该，应该（用于对做过或未做某事表示恼怒）；（强调感觉）真想；好像，仿佛

v. 能（can的过去式）

柯林斯英汉双解大词典

could /kʊd, kʊd/ CET4 TEM4

1.MODAL You use could to indicate that someone had the ability to do something. You use could not or couldn't to say that someone was unable to do something. 能; 会

2.MODAL You use could to indicate that something sometimes happened. 可能会

3.MODAL You use could have to indicate that something was a possibility in the past, although it did not actually happen. 本可能

4.MODAL You use could to indicate that something is possibly true, or that it may possibly happen. 可能

5.MODAL You use could not or couldn't to indicate that it is not possible that something is true. 可能 (与否定词)(not)(连用，表示不可能)

6.MODAL You use could to talk about a possibility, ability, or opportunity that depends on other conditions. 能; 可能

7.MODAL You use could when you are saying that one thing or situation resembles another. 像

8.MODAL You use could, or couldn't in questions, when you are making offers and suggestions. 可以 (用于建议)

10.MODAL You use could to say emphatically that someone ought to do the thing mentioned, especially when you are annoyed because they have not done it. You use why couldn't in questions to express your surprise or annoyance that someone has not done something. 本可以 (对某人未做某事表示恼怒) [强调]

11.MODAL You use could when you are expressing strong feelings about something by saying that you feel as if you want to do the thing mentioned, although you do not do it. 表示嘴上说要做实际上没有做 [强调]

14.MODAL In speech, you use how could in questions to emphasize that you feel strongly about something bad that has happened. 怎么能; 怎么会 [强调]

15.could do with →see do

could be 可能是；有可能

could have 本能够；本来也可以

how could i 我怎么能；我如何能够

could have done 本来能做成的（却没做成）

nobody could 没人能做到；那么别人也休想

could not help 禁不住，忍不住

could break 可能破碎

could do with 需要；将就；能对付

could not but 不得不…

so how could i 我又怎么能够