1.表示“有能力的”、“能干的”,可用作表語或定語。如:
He is an able manager. 他是位有能力的經(jīng)理。
He is old but still able. 他雖年老,但仍有很能干。
2.用于 be able to do sth(能或會做做某事)。如:
He is able to speak English. 他會說英語。
Everyone here is able to type. 這兒的每一個(gè)人都會打字。
He will be able to get about in a week or two. 再過一兩個(gè)星期左右他就能走動了。
He studied hard and was able to pass his examinations. 他學(xué)習(xí)很努力,所以考試及了格。
注:be able to 不僅有多種時(shí)態(tài)形式(通常不用于進(jìn)行時(shí)或與 be going to 連用),而且還可以與某些情態(tài)動詞連用(通常不與 can 連用),甚至還可以有非謂語形式。如:
Since his accident he hasn't been able to leave the house. 自出事之后,他一直未能離開家。
You might be able to persuade him. 你也許能夠說服他。
I hope to be able to do the work. 我希望能干得了這項(xiàng)工作。
I regret not being able to help her. 我很遺憾未能幫助她。
3.able 的比較級和最高級通常是abler和ablest,也可以是more able和most able,有時(shí)還可用 betterable和best able.如:
You are better able to do it than I (am). 你比我更有能力做這件事。
She's the person best able to cope. 她是個(gè)最能妥善處理問題的人。
4.若要加強(qiáng)語氣,其前除可very,quite,perfectly等修飾外,有時(shí)還可用well修飾。如:
He is quite [well] able to take care of himself. 他完全有能力照顧自己。
He's a very able student; he's just too lazy. 他是個(gè)很有能力的學(xué)生,只是太懶了。
若受just,only just修飾,則表示“只能”“僅能”。如:
I was just able to make out a dark figure in the distance. 我只能看見遠(yuǎn)處有個(gè)黑影。
5.able的反義詞是unable(不能的,不會的),不是disable,后者是動詞,其意為“使殘廢”“使無能力”。比較:
They were unable to reach a decision. 他們沒法做出決定。
Now that he was disabled, his house had become a prison to him. 因?yàn)樗麣垙U了,他的房子就成了他的牢籠。
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