be designed to do sth 是个固定句型,但为什么下面的句中 有两个 be
this computer is being designed to tell you how to reach your destination.
这个句中 第一个 is 代表什么 和 第二个 being 代表什么
为什么不可以直接 说 the computer is designed to tell you how to reach your destination.
而 下面这句却 可以直接 说成 the car is designed to help the handicapped drive.
我很困惑.