Answer 5th to 8th question immediately because tomorrow is my exam.
Q5. I shall not forgive him until he does not apologize.
Q8. He did not work, not he let other work.
5. I shall not forgive him unless he apologizes.
6. He walked fast yet / but missed his bus.
7. I fear that we might / will fall down.
8. He did not work, nor did he let others work. OR Neither did he work nor did he let others work.
6. He walked fast yet / but missed his bus.
7. I fear that we might / will fall down.
8. He did not work, nor did he let others work. OR Neither did he work nor did he let others work.