#英語單詞適當形式填空#
英語情態動詞
can和be able to表示能力時的用法相同。
can只用於一般現在時和一般過去時(could),其它時態要用be able to。
另外,表示過去某一特定情況下成功做到某事時,用be able to。
例如:
Jim couldn't speak Chinese last year, but now he can.
We will be able to come back next week.
There was a big fire in that building last night, but all the people were able to run away from it.