1.
The self-timer is sometimes very useful.
有时候定时装置很有用。
2.
It sounds very useful and efficient.
它听上去很有用，也很有效率。
3.
Because English is very useful and many people in the world are using it.
英语很有用，全世界很多人都使用英语。
4.
Tamed horse is useful to man.
训练过的马对人很有用。
5.
This is very helpful, Mrs. Martinelli.
这样很有用， Martinelli太太。
6.
The frame is a very useful one.
那个框子还很有用。
7.
This experience is valuable to me.
这一经历对我很有用。
8.
It come in very handy in the countryside.
这帽子在农村很有用。
9.
Bunk beds are useful for children.
双层床对孩子们很有用。
10.
You will get good service from thistypewriter.
这个打字机对你很有用.
11.
Maps are good for Geography.
“地图对学地理很有用。
12.
Dogs are very useful in the community.
狗在社会上很有用。
13.
I find them very useful.
我发现它们很有用。
14.
These legends are useful,
这些传说是很有用的，
15.
This medical handbook helps a lot.
这本医药手册很有用。
16.
Conductors and insulators are of great use .
导体和绝缘体都很有用。
17.
They say it pays to advertise.
他们说登广告很有用。
18.
Bunched defence is very useful to us.
密集防守对我们很有用。