Unit12 What did you do last weekend?I词性转换1.beach 复数:beaches 2.sheep 复数:sheep3.nature 形容词:natural 4.butterfly 复数:butterflies5.visit 名词:visitor 6.mouse 复数:mice7.baby 复数:babies 8.fly过去式:flew9.sing 过去式:sang 10.swim 过去式:swam11.surprise 形容词:surprised,surprising 12.wake过去式:woke13.put 过去式:put 14.tell 过去式:told 15.leave 过去式:leftII短语归纳1.do m