She could not get the money until he dies.

问题描述:

She could not get the money until he dies.
要求改成同义句.
我改的:She's not supposed to get the money until his death.
老师给了个大叉号.
She could only get the money when he dies.
请问错在哪里?

应该是这样
She's not supposed to get the money before his death.