结构是主语+动词原形;当主语为第三人称单数即he,she, it, Tom, my mother, the boy等词时，动词后加s或es.

　　如：We have an English lesson every day.

　　我们每天都要上英语课

　　Do the boys run faster than the girls? Yes, they do.

　　男孩比女孩跑的快吗?是的

　　问句借助于do, does否定句借助于don’t, doesn’t，后面动词一定要还原。