1) i should have give Susan her books, if I had meet her.
2) If she had taken sleeping pills last night, she wouldn't be sleepy today.
3) If you had invited him, he would be there now.
4) You Would understand the plot of the film if you had read the book.
5)Florence would be a famous actress if she didn't enter the musical college.
6) if they hadn't cross the road against the traffic lights, they wouldn't get in hospital.
7) if he had studied French, he would speak it fluently.
8) There wouldn't have a revolt if the government hadn't increase the taxes.
9) I would come immediately if you had called me.
10) Sarah would have recognize the man if she had seen his photo before.