What caused the accident?主语?

问题描述:

What caused the accident?主语?
2.Would you like to eat somthing 语法角度来说,没有错误吧?
类似 Would you like to drink a cup of tea?

1.特殊疑问句,就主语提问,所以What就是主语.
2.你给的两个句子不但是没有错误,实际口语中也就是这么用的.