🔑ableBrE/ˈeɪbl/NAmE/ˈeɪbl/adjectiveableadjective🔑 (≠ unable) ablyadverbabilitynoun🔑 (≠ inability) disabledadjective🔑disabilitynoun🔑~todosth() tohavetheskill, intelligence, opportunity, etc. neededtodosth能；能够◆YoumustbeabletospeakFrenchforthisjob. 干这项工作你得会说法语。◆Aviralillnessleftherbarelyabletowalk. 一场病毒引起的疾病使她走路都十分困难。◆Ididn'tfeelabletodisagreewithhim. 我觉得不能不同意他的意见。◆Willyoubeabletocome? 你能来吗？OPPunablecan / could / be able to / manage
Can is used to say that somebody knows how to do something. * can 表示懂得做：◆Can you play the piano?你会弹钢琴吗？ It is also used with verbs of seeing, noticing, etc.该词亦与表示看见、注意到等的动词连用：◆I can hear someone calling.我听见有人在呼叫。and with passive infinitives.并与不定式的被动形式连用：◆The podcast can be downloaded here.播客可在此下载。
Can or be able to are used to say that something is possible or that somebody has the opportunity to do something. * can 或 be able to 表示某事情有可能或某人有机会做某事：◆Can you/are you able to come on Saturday?你星期六能来吗？
You use be able to to form the future and perfect tenses and the infinitive.用 be able to 构成将来时、完成时和动词不定式：◆You'll be able to get a taxi outside the station.在车站外可搭乘出租车。◆I haven't been able to get much work done today.我今天未能干多少工作。◆She'd love to be able to play the piano.她很希望能弹钢琴。
Could is used to talk about what someone was generally able to do in the past. * could 表示过去通常能做：◆Our daughter could walk when she was nine months old.我们的女儿九个月大就会走路了。
You use was/were able to or manage (but not could) when you are saying that something was possible on a particular occasion in the past.关于在过去特定情况下可能的事用 was/were able to 或 manage，但不用 could：◆I was able to/managed to find some useful books in the library.我总算在图书馆找到了一些有用的书。◆I could find some useful books in the library. In negative sentences, could not can also be used.否定句也可用 could not：◆We weren't able to/didn't manage to/couldn't get there in time.我们未能及时赶到那儿。Could is also used with this meaning with verbs of seeing, noticing, understanding, etc.亦可用 could 加表示看见、注意到、明白等的动词表示此义：◆I could see there was something wrong.我发觉出事了。
Could have is used when you are saying that it was possible for somebody to do something in the past but they did not try.表示过去有可能做某事但没有做，用 could have：◆I could have won the game but decided to let her win.我本可以赢得那场比赛，但还是决定让她赢了。
(ablerBrE/ˈeɪblə(r)/NAmE/ˈeɪblər/, ablestBrE/ˈeɪblɪst/NAmE/ˈeɪblɪst/) intelligent; goodatsth有才智的；有才能的；（某方面）擅长的◆theableststudentintheclass班上最有才华的学生◆Weaimtohelpthelessableinsocietytoleadanindependentlife. 我们的宗旨是帮助社会上能力较弱的人独立生活。➡ see alsoably