ANSWERS

1. If I study hard, I will get high grades.
   
   Let p = "I study hard", and q = "I will get high grades."
   Answer: If p, then q.
   
   
2. If I do not study hard, I will not get high grades.
   
   Answer: If not p, then not q.
   
   
3. If I study hard and do not go to too many parties, then I will get high grades.
   
   Let p = "I study hard", q = "I go to many parties", and r = "I will get high grades."
   
   Answer: If p and not q, then r. Or alternatively, If (p and not q), then r.
   
   
4. If I get good grades in computer science, or if I am very lucky, I will get a high paying job.
   
   Answer: If p or q, then r. Or alternatively, If (p or q), then r.