人教版英语初中八年级上册知识讲解,巩固练习(教学资料,补习资料)
（2019·恩施）—— Have you seen the movie Titanic, Wangwei?
—— Yes. The music in it ________.
A. looks great
B. sounds great
C. feels great
B
【答案】
3. Were you able to keep them?
be able to表示＂能够＂，相当于can，常用来表示can不能表达的将来时或完成时的情况，可用于各种时态。
He will be able to finish reading the book next week.
他下周将能读完这本书。
【易混辨析】
can / be able to
(1) can＂能＂，表示过去或现在＂能力所及＂时，与be able to 通用。
He can / is able to speak German. 他会说德语。
I could / was able to run very fast when I was a boy. 我小时候就跑得很快。
(2) be able to的过去式还可表示一种＂经过努力做到了＂的意思。而can的过去式则没有这
种意义。
He started late, but he was able to catch the train. 他出发晚了，但他还是赶上了火车。
(3) can通常只用于过去或现在两种时态，而be able to 则可用于各种时态。
He has not been able to come since he got hurt. 自从受伤以后，他就一直未能前来。
(4)在表示猜测时，只能用can，而不能用be able to。
That can’t be your bag. 那不可能是你的书包。