I often get up at six thirty

六点三十分───It's six thirty;起床───get up

For twins it's thirty-six.───而双胞胎则是三十六周。

I was supposed to be at home for dinner at six and it's already seven-thirty.───我应该六点到家吃晚饭的，可现在已经是七点半了。

It's six thirty in the evening.───现在是晚上的六点三十。

It's six thirty in the evening . Li Fen and Mr Green are talking .───现在是晚上六点半了。李芬和格林先生正在谈话。