十二的英语是：twelve，音标：英 [twelv]美 [twelv]。十二的序数词变化不规则，需要把ve变成f再加th，twelfth，音标：英 [twelfθ]美 [twelfθ]。

例句示范：

We have been gradually bled for twelve years 

我们被一点一滴地压榨了12年。

We were set upon by about twelve youths and I was kicked unconscious. 

我们遭到了大约12名青年的袭击，我被踢晕过去了。

I shall stay here until twelve o'clock. 

我将留在这里一直到十二点钟。

I met some friends and stayed out until eleven or twelve. 

我见了几个朋友，直到夜里十一二点才回家。

He had a tea-break about twelve. 

十二点左右，他放下工作休息了一下。

The building will house twelve boys and eight girls 

这座房子里会住12个男孩和8个女孩。

Twelve Cubans left the embassy after sheltering there for several days. 

12名古巴人在大使馆藏身了几天后离开了。

The year is divided into twelve months. 

一年分为12个月。

She is entitled to a twelfth of the cash. 

她有权获得这笔钱的1/12。

As usual there will be the local and regional elections on June the twelfth 

照例，6月12日将会进行地方及区域选举。

The tower, incidentally, dates from the twelfth century. 

那座塔，顺便提一下，可以追溯到12世纪。

The first British attempt to colonize Ireland was in the twelfth century 

英国最早尝试在爱尔兰开拓殖民地是在12世纪。