Here are the correct forms of the verbs in parentheses:

1. if I had known my friend was in the hospital, I **would go** to see her.
2. I did not see you in the pool yesterday. If I had seen you, I **would swim** with you.
3. My mother did not go to the gym yesterday. She **would have gone** if she had not been so tired.
4. She (not leave) **would not have left** home if her father had not disturbed her.
5. If he had been looking in front of himself, he (not walk) **would not have walked** into the wall.
6. The view of the mountain was wonderful. If I had had a camera, I (take) **would have taken** some pictures.
7. She was not thirsty. If she had been thirsty, she (drink) **would have drunk** some water.
8. If my grandmother had gone to the university, she (study) **would have studied** science. She likes science a lot.
9. If I had known how to swim, I (swim) **would have swum** when we went to the beach.
10. If you had given a direct address to me, I (find) **would have found** that museum easily.
11. If I had enough money, I (buy) **would buy** a big house for myself.