1.can仅表示有能力做成某事但不含有做成的意思,be able to 表示的是能够做成某事,且做了,若用were able to 则表示本来能够做成,却没做.
2.need做情态动词一般用于疑问句或否定句中,该题中的needn't看起来像是情态动词,但别忘了情态动词后要有实义动词,假如后面接一个get就可以选D了.C选项中的need是及物动词后面直接跟宾语.
3翻译当Gordon Howard 告诉你他是一个百万富翁时,可能是在和你开玩笑,因为他总是戏弄别人.后面那句一般现在是表示的是他一贯如此,所以用一般现在时.前面是对过去发生的事的一种推测,属于虚拟语气范畴.对过去发生的事进行推测时,只能用情态动词+have done
may have been推测过去可能处于某种状态
may have done 推测过去可能干过.
may have been doing推测过去可能一直在干.
He may have been a teacher as a young man ; he is good at teaching his kids .
He may have lost his job because he can't afford toys for his son now .
He may have been looking for a job because he is out of work now .
4.John正在踢足球,但是他现在应该在学习.should be doing表示应该正做某事却没做
5.题中说的是小事侯的事,所以用could比can更合适,至于你说的be able to 句子就得改为
When I was young,I used be able to run ten miles without stopping.
“I could” and “I was able to” are not the same.“I could” means I used to be able to,but now I’m not able to.“I was able to” means I have the ability at one particular time in the past.
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