Unit 3：
watch—watched 看 wash—washed 洗 clean—cleaned打扫 play—played玩 visit—visited 看望 do—did last weekend上一个周末 go—went去 go to a park—went to a park 去公园 go swimming—went swimming去游泳
go fishing—went fishing去钓鱼
read—read 读 go hiking—went hiking 去郊游
Unit 4：
learn Chinese—learned Chinese学汉语sing and dance—sang and danced 唱歌和跳舞 eat good food—ate good food吃好吃的食物take pictures—took pictures 照相 climb—climbed 爬 have—had buy presents—bought presents买礼物
row a boat—rowed a boat 划船 see elephant—saw elephant 看大象
go skiing—went skiing 去滑雪 go ice-skating—went ice-skating 去滑冰
how怎么,如何 get—got 到达 last上一个的,仅余的,留在最后的