1.Darkness fell across the valley. 为什么是fell而不是fall或者fallen?
2.A tear of joy fell from Mother's face.为什么是fell而不是fall?
3.He fell twice yesterday!为什么是fell而不是fallen?
4.Two missionaries were flown to America.为什么是flown而不是flew?
对过去式和过去分词的区别和用法还不是很熟悉,还请详细解答!
感谢!!!