Question

英语中几个关于情态动词考察的题目,请教

1. They started late but the ____ get there in time.
A could B can C were able to D may
个人的理解是选b can 表可能性时的考察. 虽然前面是过去时,但后面in time表将来,个人理解选can 但是书中答案给的是 were able to ,个人认为这里虽然和前面一致了而且be able to 是对过去具有的能力的推测.但是和后面的 in time冲突,求达人指教到底哪个对.
2 To travel from England to Scotland you ____ a passport.
A mustn't have B haven't got C don't need D needn't
个人选的D needn't 不需要,答案给的是c dont't need .求解释
3 Gordon Howard ____ with you when he told you he was a millionaire; he often likes to kid people.
A may be joking B may have been joking C may joke D must be joking
这个我选择的d， 看到后面是一般现在时所以这样选，答案是b may have been joking 有点不理解这个完成进行时的用法 求具体解释。
4 John is playing soccer, but he_____
A should be studying B should studying C ought to be studies D ought to studying.
这个根本不理解了为什么是A should be studying.求解释啊
5 When I was young, I ____ ten miles without stopping.
A can run B could have run C could run D could be run.
在a和c之间我选了a，因为can比could比更语气强可是答案是could，书中解释当表示过去具体能力或将来能力时不用can/could , 而用be able to. 求解释。

最好一个个帮忙解释下，不要把大段情态动词的语法复制过来。

Answer 1

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.
好费劲，给分吧！

Answer 2

需要解析的题目建议一个个问。这样一大段，我们看了第一个 再下面回答时根本看不到原题。

追问

不会吧.只有第1么

追答

我们看第一个的时候，在下面答就看不到原题了，同样，每个题目我们都无法看题目做解释。

而且你分开提问，答题的人可以多拿些分数。 这样一大堆我们全答了也只能拿一次分数，所以大部分人不会来答。

Answer 3

4 他本应该做的却没有做

Answer 4

最佳答案为c。表示“责任与义务”的情态动词一般多用should；其它三个情态动词均表示“可能”。