10 saves
E2:
1 had been -> were
2 doing -> to do
3 did not rain -> rained
4 had I known -> I had known
5 had knew -> had known
6 had finished -> finishes
7 confident -> confidently
8 be lost -> have lost
9 would write -> would have written
10 would stop -> would have stopped
E3:
1 If they understood the problem, they would find a solution
2 If you don't go right now, you'll be late for the train
3 If John didn't eat so many chips, he wouldn't be fat
4 Unless you tell Bill what do to, he never does anything
5 If they had enough time, they could do me a favour
6 If I don't leave now, I will miss the flight
7 If we don't hurry up, we will be late for the exam
8 If he doesn't phone her immediately, he won't get any information
9 If they don't find out the remedy, the patient will die