(5)fish in troubled waters混水摸鱼，乘人之危。

　　He's always been good at fishing in troubled waters; he made a lot of money by buying houses that were bombed in the war.他总是善于乘人之危大捞一把，他靠购买在战争中遭过轰炸的房屋而赚了大量的钱财。

　　(6)fish out of water离水之鱼，不得其所。

　　She felt like a fish of water at the evening party because she knew no one. 她在晚会上感到很局促，因为她一个人也不认识。

　　(7)gives someone an inch and he will take an ell得寸进尺。

　　If you give those people an inch，they'll take an ell;we told them they might use our side path to reach their garden，now they have fenced in the path so that we cannot use it ourselves.那些人就是得寸进尺;我们对他们说，他们可以经过我们的小道进他们的花园，现在他们已在小道上修起了篱笆，以致我们自己也无法走这条小路过去了。

　　(8)go west上西天，死，失败。

　　Poor John was one of those who went west in the explosion.可怜的约翰是在这次爆炸中魂归西天的人物之一。