e.g. I should(would) do the work now if I were free.
If I had read the article, I should know its contents.
If I had been free(were free), I should have done it yesterday.
A.1. If the boy had found the book, . 2. The horse would have won the face if . 3. they would be free now. 4. If were you, 5. They would have left long ago . 6. if you had called yesterday. 7. In case the librarian were out, 8. Suppose you had gone there yourself, 9. provided they got the material. 10. Supposing we had all the information at our disposal . 11. I would not have unless 142. If only , they would not .