Công thức : Should + S + V, S + will/should/may/shall + V… :(Nếu như… thì …)
1 : should he run , he will get there on time
2 :should it be rany tomorrow , we won't go to shcool
3 : Should the airplane drop , no one will survive
4 : Should we put ice under sun,it will melt
5 : Should you mix blue and yellow,you will get green
6 : Should children be criticized in public,they will lose their confidence