$\text{1/ If I had known that you were in hospital, I would have visited you.}$
$\text{2/ If you don't hurry up, you will be late.}$
$\text{3/ If she weren't busy, she could help me now.}$
$\text{4/ If he had known my phone number, he would have phoned me.}$
$\text{5/ If you took exercise, you would be fit.}$
$\text{6/ If you aren't careful, you'll cut yourself with that knife.}$
$\text{7/ Unless I have time, I won't help you.}$
$\text{8/ If he had studied his lessons carefully, he wouldn't get bad marks now.}$
$\text{9/ If Dick drove carefully, he wouldn't cause many accidents.}$
$\text{10/ If I knew English, I could apply for that job.}$
$\text{11/ If Susan didn't eat too much chocolate, she wouldn't be overwweight.}$
$\text{12/ If he weren't lazy, his father wouldn't punish him.}$
$\text{13/ If you don't study harder, you'll fail in the next exam.}$
$\text{14/ If we had had time, we would have visited the museum.}$
$\text{15/ If Jack hadn't helped me, I wouldn't have been be able to move to the table.}$
