1. He told me he knew exactly what she had done the previous night.
=> Tường thuật câu trần thuật: S + told someone/ said that + clause (đã lùi 1 thì so với câu gốc).
2. I regret not finishing homework last night.
=> Regret (not) doing sth: hối hận vì đã (không) làm gì.
3. Despite having much experience in machinery, he didn't succeed in repairing this machine.
=> Despite + noun/ V-ing: mặc dù
4. Though it was dark, he continued to work.
=> Though + clause: mặc dù