为什么好多试题“I often go shopping on weekend”中的weekend都是没有加s?是不是出错

为什么好多试题“I often go to shopping on weekend”中的weekend都是没有加s?是不 I often play sports. ( )I go shopping on the weekend. I often goes shopping on the weekend.（就画线部分 I usually go shopping on the weekend上一句是什么 i often go shopping on sundays .为什么sanday要加s啊 I have too much homework this weekend中的this weekend能加S么 为什么 every weekend i go shopping.翻译 My mother and I often go shopping （at the weekend）对括号内部分提问. i often going to go shopping last weekend怎么改为否定句 l go some shopping with my mother on the weekend.改为否定句 lt's I'd like[ ]go shopping[ ]the weekend.A.to-----in B./-----on I usually (go shopping) on the weekend.(对括号里提