一到英文单选题Idon'tthinkhecouldhavedonesuchastupidthinglastnight,?A.doIB.couldIC.didheD.hashe我才上高一学生,以前做的反义疑问句超简单,但是现在被这道题难住了,纠结死……

Question

一到英文单选题
I don't think he could have done such a stupid thing last night,____?
A.do I B.could I C.did he D.has he
我才上高一学生,以前做的反义疑问句超简单,但是现在被这道题难住了,纠结死……

Answer 1

think suppose believe 在宾语从句（he could have done such a stupid thing last night）否定时 否定提前到主句所以don't think
但基于主语不同分为两类
1、主语是i 对从句提问 那么疑问根据从句来 先把否定词返回couldn't have done 这个结构是虚拟表猜测 (类似的有must\need \should\ought to\may\be able to have done) 所以提问 按照该句本来应有的时态did such a stupid thing last night 所以did he
2、主语非i只要对主句提问就行