because it was his twelfth birthday yesterday的问句是什么

because it was his twelfth birthday yesterday的问句是什么

没有具体语境的话,这个问句是有很多的
比如 why did he hold a party yesterday?
他昨天为什么举办了一个晚会?

why did he so excited yesterday?

这句话的意思是“因为昨天是他的十二岁生日。”你可以自己写问句，但应是由WHY引导的问句。例如，Why he got so many presents yesterday?