fifth的複數加s還是es

fifth加s

例句

1、

He lifted the cup for the fifth time this year.

他今年第五次舉起了獲勝獎盃。

2、

Her mother had just given birth to another child， her fifth.

她的母親剛又生了孩子，她的第五個孩子。

3、

It's the fifth time that I've been to America.

這是我第五次去美國了。