how come you are working here=how come you to work here?

问题描述:

how come you are working here=how come you to work here?

第一个句子how come 后跟的是一个完整的句子做how come的宾语,相当于how come that you are working here?
第二句子you 可以看做是how come 的宾语,而动词不定式 to work here 充当you 的补足语.所以两个句子是对等的.