可以。be happy可以單獨使用，當(dāng)祈使句用：Be happy.就像給人忠告一樣，言下之意為“要做個開心的人”，或者有人很傷心，你就可以只是簡單地回答“Be happy”，言下之意為開心起來。

be happy例句

I can assure you that your daughter will be happy here.

我可以向你保證，你女兒在這里會很快樂的。

"Families can look a bit more for where the residents are going to be happy," Dr.Sloane said.

“家庭可以更多地尋找讓這些居民感覺快樂的地方。”斯隆博士說。

Main Street won't be happy with this new program.

中產(chǎn)階級不會對這個新計劃感到高興的。

鼓勵別人可以怎么說

1、Hang in there!

別松勁!

2、Keep at it!

堅持下去!

3、Keep your chin up!

要有信心!

4、Try harder!

再加把勁!

5、Don't give up!

別認輸!/別放棄!

6、Keep it up!

堅持下去!

7、Never give up!

絕對不能放棄!

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。