省略if，从句的语序用到装，即将
were,
had或should
移至主语的前面，但否定词
not不前移。
1
、与过去事实相反：从句
sbhad done
，主句sbwould(should,
could,might
)+ have done
；1. Had Judy been more careful on the
maths
exam, she _could have got___ much better
s now.2008
A. would be getting B. could have got C. must get D. would get
2. He would have finished
college education, but he _
had___to
quit and find a job to support his family.2007
A. had had B. has C. had D. would have
3._Had he not been taken ...