1. Due to her not having a lot of friends, she does not go out a lot.
2. I cannot do the homework because I didn’t understand the lesson.
3. If I would have known you were in the hospital, I would have came to see you.
4. Because Peter was studying, he did not answer the phone.
5. She feels nervous, because she is very short.
6. I won’t let you go outside if you don’t close the door.
7. He never looks smart because he does not polish his shoes.
8. I don’t understand this lesson because of its complexity.
9. You should head to sleep early.
10. Because Peter did not prepare well for his lesson, he got bad marks.
Hope this is what you needed!