“对国家有用”用英语怎么讲？

Question

he wants them to be useful （to|with|for|about）the country

用哪个介词？

Answer 1

用to

另外一个例句:
John always tries to cultivate people who are useful to him.
约翰经常设法和对他有用的人结交。本回答被提问者采纳

Answer 2

be useful for
prep. 具有...用途

Inquiring deeply into the things will be useful for us to approach Huang BinHong.
寻根溯源,对于走近黄宾虹,无疑大有裨益。
-- dict.cnki.net
but they will not be useful for long trips.
但对长途旅行来说，他们就没那么有用了。

Answer 3

用for,be useful for是对什么有帮助，对什么有用的意思，为固定搭配。

Answer 4

for 表示对象

Answer 5

for