The film began half an hour ago.(改为同义句） The film ____ ____ ____ half an hour. The film finished half an hour...

The film【has been on for 】half an hour.
题目少给了一个空，begin 是短暂性动词，和一段时间 half an hour 连用，必须转化为延续性动词 be on ，且必须和介词for 连用。

祝你开心。

The film had began before half an hour.

has been on for

希望有帮助!

The film has been on for half an hour。（改为同义句）~

The film began half an hour ago.
或
The film has been on since half an hour ago.
或
It is half an hour since the film began.

The film has been over for half an hour.