非谓语动词基础差适合
  找出各句的谓语动词并指出其具体形式　1. Don't teach fish to swim.  不要班门弄斧。
don't teach，谓语动词否定式
  2. He had a good memory like an elephant.  他以前有很好的记忆力。　  3. It would be a waste of money building such a luxurious villa.  建这么豪华的别墅太浪费钱。
had，谓语动词过去式 would be，附加情态动词的动词原形