你说的是宾语从句吧,其中有一种情况就是比如：The teacher said that the light travels faster than sound.
travel没变成过去时因为这是真理,光比声的速度快
主语是甚么句从句时态不变?
你说的是宾语从句吧,其中有一种情况就是比如：The teacher said that the light travels faster than sound.
travel没变成过去时因为这是真理,光比声的速度快