He opened his mouth as if he were to speak 和He opened his mouth as if he had spoken有什么不同

题目

He opened his mouth as if he were to speak 和He opened his mouth as if he had spoken有什么不同

答案

he were to是虚拟语气,后边动词表示的动作尚未进行,意思是他张了张嘴,好像要说话的样子（但是还没有说话）.
had done是过去完成时,表示动作已经完成（好像他刚说过话）.