1. Should he be late for our trip, he won't go with us.
2. Were Lan to live near school, she wouldn't get to school late.
3. Had he not helped, we wouldn't have finished our work.
Cấu trúc:
Đảo ngữ cđk loại 1:
$Should+S1+(not)+V$$_{0},S2+will/can/may...+V$$_{0}$
Đảo ngữ cđk loại 2:
$Were+S_{1}+(not)+to+V$$_{0},S$$_{2}+would/could/might...+V$$_{0}$
Đảo ngữ cđk loại 3:
$Had+S_{1}+(not)+V$$_{p}II,S$$_{2}+would/could/might...+have+V$$_{p}II$
