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柯帕斯英语简明惯用法词典: able
■able/'eɪbl/
adj.
1.表示“有能力的”“能干的”，可用作表语或定语。如：
(1)用作定语：
He is an able
manager. 他是位有能力的经理。
He’s an able politician, but he’s not one of us. 他是位能干的政治家，但他不是我们自己人。
The government is
led by an able team of skilled politicians. 政府由一批干练的政治家领导。
(2)用作表语：
He is old but
still able. 他虽年老，但仍有很能干。
She seems very
able. 她好像很能干。
I will help you
as far as I am able. 我会尽我所能帮助你。
Everyone
contributes according as he is able. 每个人根据自己的能力作出贡献。
The dancers were
technically very able. 这些舞蹈演员的演技十分出众。
She’ll help us, inasmuch as she is able. 只要她力所能及，她就会帮助我们。
2.able的比较级和最高级有两种构成方式，既可加-er, -est，也可加more, most。如：
He is the
ablest / most able student in the class. 他是班上最有才华的学生。
She’s an
abler teacher / a more able leader than he is. 她是比他更称职的领导。
有时还用better able和best able构成比较等级。如：
He is better able to do the work than I am. 他比我更能做好这工作。
It should
be done by those who are best able to do it. 这事应该由最有能力的人去做。
3.用于 be able
to do sth结构，其意为“能做某事”“会做某事”。如：
He is able to
speak English. 他会说英语。
Everyone here is
able to type. 这儿的每一个人都会打字。
He will be able
to get about in a week or two. 再过一两个星期左右他就能走动了。
He studied hard
and was able to pass his examinations. 他学习很努力，所以考试及了格。
be able to 不仅有多种时态形式（通常不用于进行时或与 be going to 连用），而且还可以与某些情态动词连用（通常不与 can 连用），甚至还可以有非谓语形式。如：
Since his
accident he hasn’t been able to leave the house. 自出事之后，他一直未能离开家。
You might be able
to persuade him. 你也许能够说服他。
I hope to be able
to do the work. 我希望能干得了这项工作。
I regret not
being able to help her. 我很遗憾未能帮助她。
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