七点半用英语表达两种方法：seven thirty 或 half past seven。

seven：

num.七；

复数： sevens

half：

n.一半;半;(比赛、音乐会等的)半场，半局;(啤酒等饮料的)半品脱；

det./pron.半数;绝大部分；

adv.到一半程度;半;部分地；

复数： halves

We started German in year seven.

我们在七年级开始学习德语。

The cost is about half as much again as it was two years ago.

现在的价格比两年前提高约一半。

One and a half hours are allowed for the exam.

考试时间为一个半小时。

It really isn't half bad, is it?

这的确很不错，对吗？