I only arrived half an hour ago.

我半小时前才到。

Horace: Half an hour ago.

霍勒斯: 半个小时前.

The plane landed in Paris half an hour ago.

飞机已于半小时前到达巴黎。

The train was supposed to arrive half an hour ago.

火车本应该在半小时前到达。

I saw him very much in the flesh only half an hour ago.

就在半小时前，我看到他还活得好好的。

Where are all the people? It started half an hour ago.

人们都到哪里去了？半小时前就开始了。

You can't be hungry yet; you had a big cake only half an hour ago.

你现在不可能饿，半小时前你才吃过一只大蛋糕呀！