last weekend,通常作为什么句子成分?为什么有时候前面又加上了介词?为什么有时候前面又加上了介词？

last weekend,通常作为什么句子成分?为什么有时候前面又加上了介词?为什么有时候前面又加上了介词？ last weekend什么意思 last weekend were you busy last weekend? 什么意思 See you last weekend什么意思 Did they have a good time last weekend?改为同义句：Did they ( ) ( ) last weekend? Sally stayed at home last weekend.（改为同义句）Sallly ( ) at home last weekend. They had a good time last weekend.的同义句是They ()()()()last weekend. She did housework last weekend.改为否定句 weekend,went,last,Mike,skiimg连词成句 She did her homework last weekend.改为否定句 Many was very busy last weekend.改为否定句 Mary had a birthday party last weekend的否定句 by,went,last,we,airplane,there,weekend.连词成句 My brother did some reading last weekend.变为否定句 连词成句.busy,my father,last weekend,was. you,were,where,last,weekend连词成句 Jim visited hie grandparents last weekend.改否定句