⑴ 當我們到達電影院時，電影已開始二十分鍾了（翻譯成英語）
翻譯如下：
當我們到達電影院時，電影已開始二十分鍾了
When we arrived at the cinema, the film had already been on for twenty minutes
⑵ 電影開始半個小時了英語四種翻譯
The film has been on for half an hour.
The film has been on since half an hour ago .
The film began half an hour ago.
It's half an hour since the film began.
Half an hour has passed since the film began.