c 在周末的固定介词搭配 at或on,没有on
a yesterday,很明显的一般过去时态
b 第一人称主语,借助助动词原型来做否定句
c 跟picnic搭配的介词,on或者for,没有for
b cheese 奶酪,不可数
b 介词to+宾格人称,读给我听,at意思不对
what did you do ____ the weekend?
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