常用fall [fɔ:l]vi.落下；变成；来临；减弱
n.秋天；瀑布；下降
例1.And now my tears began to fall.
现在我的泪水开始落下来了.
例2.Leaves fall off the trees in the autumn.
秋天,树叶纷纷从树上掉下来.John------(落下)his keys at home that morning。John left(leave的过去式）his keys at home that morning