It's not seven thirty

七点半───half past seven;没有───No,

Classes start at half past seven.───七点半钟开始上课。

It's half past seven.───现在七点半。

He signed on at half past seven.───他于七点半签到上班。

What time did she have breakfast yesterday? She had breakfast at half past seven. . .───昨天她什么时候吃早餐？她七点半吃早餐。

Afternoon tea is from four to five in the afternoon, and dinner is at about half past seven.───午茶在下午的四点到五点，晚饭在大约七点半。

It was half past seven in the evening when at last, exhausted, he heard Aunt Petunia calling him.───一直到晚上七点半，才终于听到佩妮姨妈喊他，他已经精疲力竭。

Dinner is at eight, so come at about half past seven.

At half past seven I put some water on to have a shave.

I went to school at seven o'clock this morning although I don't belong to go to school until half past seven.