The plan is heard designed so well that we don't hane to make any changes.为什么用 designed 而不用to designed不是be heard to do sth

The plan is heard designed so well that we don't hane to make any changes.为什么用 designed 而不用to designed不是be heard to do sth
The plan is heard designed so well that we don't hane to make any changes.
为什么用 designed 而不用to designed
不是be heard to do sth

The plan is heard designed so well that we don't hane to make any changes.为什么用 designed 而不用to designed不是be heard to do sth
因为这里的design是被动语态,被设计
所以应该是be heard （to be） done,
to be省略掉了.

不是的，be heard to do sth 的主语是人，所以主语是物的话要用被动态，
应该是be heard to be done sth ，to be可以省略就成了上面那样了