这个句子不对吧。。
How come 通常是表示询问原因的。doing 是及物动词,后面要有宾语啊。
are 和 your weekend 主谓不一致。
其实 what did you do in the weekend就好了,不用加LAST,因为周一来谈论周末都知道是才度过得周末。
一般问how is your weekend?别人就能说他周末怎么样,做了什么等等
不对,
应该为What did you do in last weekend?
(现在已经是星期一了,所以应该用上个周末)
如果是说这周末即将来时的话,可以说what's your plan for this weekend?如果指的是上周末,可以说what did you do last weekend?
how was your weekend?就OK了。因为是过去了的所以用WAS
愣是要用WHAT开头的就what did you do last weekend?没必要加IN。