be able to和can的区别I went there in 1984,and that was the only occasion when I ________ the journey in exactly two days.A.must take B.must have madeC.was able to make D.could makeC D的区别?

问题描述：

be able to和can的区别
I went there in 1984,and that was the only occasion when I ________ the journey in exactly two days.
A.must take
B.must have made
C.was able to make
D.could make
C D的区别?

答

举个例子吧，不如你没有学过跳舞，就用can，而你会跳舞，但是因为某种原因没办法做到，就用be able to，还有就是can是情态动词，好多种用法呢……可是书不在手边……不好意思了！

答

can 和be able to 都可以表示能力.can泛指一般的能力,而且只有两种形式,即:can, could．be able to 则主要指具体做到了某件事的能力，其形式主要是靠be 发生变化，所以形式比can 多．可以说：I can swim. I am able to swim. 但是不能说：All the people could escape from the big fire in time. 只能说：All the people were able to escape from the fire in time.

答

be able to 是指主观上有这种能力
can 是指客观上你能这么做，或被允许这么做

答

be able to可用于不定式后

答

2点不同：第一：can只用于过去时(过去式为could)和现在时，而be able to用于任何时态。第二：变一般疑问句时，前者把can提前，后者为be+主语+able to....？

答

be able 表示有能力做到
can 表示可能做到

答

can 和be able to 都可以表示能力.can泛指一般的能力,而且只有两种形式,而be able to 则主要指具体做到了某件事的能力，其形式主要是靠be 发生变化，所以形式比can 多，两者有时可换用．但be able to 的过去时意思是”通过努力而能够”或表示”已尝试过”，因此该题答案应为”C”．

答

can 和be able to 都可以表示能力.can泛指一般的能力,而且只有两种形式,即:can,could．be able to 则主要指具体做到了某件事的能力,其形式主要是靠be 发生变化,所以形式比can 多．可以说：I can swim.I am able to s...

答

can 表示一个人长期的能力,如:I can swim.
be able to是表示一个较短暂的过程

be able to和can的区别I went there in 1984,and that was the only occasion when I ________ the journey in exactly two days.A.must take B.must have madeC.was able to make D.could makeC D的区别?

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