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可以。be happy可以单独使用，当祈使句用：Be happy.就像给人忠告一样，言下之意为“要做个开心的人”，或者有人很伤心，你就可以只是简单地回答“Be happy”，言下之意为开心起来。
be happy例句
I can assure you that your daughter will be happy here.
我可以向你保证，你女儿在这里会很快乐的。
"Families can look a bit more for where the residents are going to be happy," Dr.Sloane said.
“家庭可以更多地寻找让这些居民感觉快乐的地方。”斯隆博士说。
Main Street won't be happy with this new program.
中产阶级不会对这个新计划感到高兴的。
鼓励别人可以怎么说
1、Hang in there!
别松劲!
2、Keep at it!
坚持下去!
3、Keep your chin up!
要有信心!
4、Try harder!
再加把劲!
5、Don't give up!
别认输!/别放弃!
6、Keep it up!
坚持下去!
7、Never give up!
绝对不能放弃!
8、You can do it!
你可以的!
9、You can do that!
你可以的!
10、Look on the bright side.
你得看到事情好的一面。