下面那句话为什么不对?

问题描述:

下面那句话为什么不对?
Most drivers know not only that excessive speeding on highways wastes gasoline,but also that it is dangerous.
Most drivers are knowledgeable that excessive speeding on highways not only wastes gasoline,but also that it is dangerous.

很简单.第二句最后4个词"but also that it is dangerous"的用法出错.
应为"but is also dangerous".