一. 词性 n. v.

useful adj.有用的

usefully adv.有用地

useless adj. 无用的

二. 结构：

use sth to do sth用...做...

be used to do被用来做

=be used for doing 被用来做

be/get used to doing 习惯做

be used as 被用作…

used to do 过去常常

use up用光

make(good / full ) use of(好好 / 充分) 利用

come into use 开始使用

put sth to good use有效利用

be of no use 无用

There is no use doing sth. / It's no use doing sth. 做某事没有用

be useful to sb对某人有用

be useful to do sth 做某事是有用的

=be useful for (doing) sth 做某事是有用的

三. 习题呈现

1. I think you’ll soon get used to ___________(live) in the country.

2. I never used to ___________(get) up early, but now I get up at 5 o'clock every day. 

3. This table is used _______(put) flowers picked in the garden just now.

答案解析：

1. living 翻译为习惯乡下的生活 get used to doing
2. get 因为used to do 过去常常
3. put be used to do 是被用来做