初中英语必考句型详解-122：be able to do的句型
【经典必背】
At thirty, a man should be able to think for himself. 三十而立。
【课文原句】
On the weekend, I'll be able to dress more casually. 周末的时候，我能够穿的随意一些。
In the beginning, though I would never be able to remember all the words and do everything right at the same time. Slowly, everything became easier. 开始的时候，尽管我不能够记住所有的单词，也不能把所有的题做对。但是，慢慢地，一切变得容易了一些。
Michael isn't able to come. 迈克尔不能来。
【基础知识】
be able to do sth.＝can/could do sth.意为“能够做某事”。be able to有人称、时态和数的变化，但是can只有现在时和过去时两种时态。
I'll be able to study in a college in four years. 4年后我将会在一所大学里学习。
We couldn't speak English at the age of five. 5岁的时候我们不会讲英语。
【牛刀小试】
1. — Will you be able to come and help us clean the room?
— _____, but I'm doing my homework.
（2010杭州）
A. I'd love to
B. I hope not
C. I do care
D. I'm afraid not
2. I won't be able to understand what you say, _____ you speak too quickly.
（2010成都）
A. if
B. though
C. because
3. — _____ you swim?
— Yes, but I'm not a good swimmer.
（2010北京）
A. Can
B. May
C. Need
D. Must