1.楼主肯定打错字了,问题应该是:
The film began about an hour ago.
2.答案有很多种,列举一些以供楼主选择使用:
The film began about an hour ago.
= The film has been on for about an hour.
= The film has been on since about an hour ago.
= About an hour has passed since the film began.
= It is about an hour since the film began.
= It has been an hour since the film began.