1) Nick was (past simp act) sure that he would pass (fut-in-the-past simp act) the exams successfully.
2) When I came (past simp act) home late in the evening, my parents had already had (past perf act) dinner.
3) Ann couldn't (past simp act) go to the theatre with us because she had (past simp act) to prepare for the exam.
4) Please wait for me if you come (pres simp act) earlier.
5) Why don't you make (pres simp act) a cup of coffee while I'm finishing (pres cont act) this?