Unit 16 Revision Lesson 91 教学目标 复习13—15单元所学的交际用语, 能够运用这些交际用语进行情景对话。 watch—watched play—played stay—stayed clean—cleaned visit—visited row—rowed climb—climbed dance—danced sing—sang eat—ate study—studied do—did go—went is(am)—was are—were see—saw swim—swam drink—drank lose—lost sleep—slept have—had ride—rode make—made teach—taught meet—met take—took buy—bought become—became start—started say—said win—won When were you born? When did you learn to play the piano? Where did you go last winter?