8.5 cease doing/to do
        
        cease to do　 长时间，甚至永远停做某事。
        cease doing　 短时停止做某事，以后还会接着做。
        
        That department has ceased to exist forever.
        那个部门已不复存在。
        The girls ceased chatting for a moment when their teacher passed by.
        姑娘们在老师走过时，停了会聊天。
        8.6 try doing/to do
        
        　try to do努力，企图做某事。
        　try doing　 试验，试着做某事。
        
        You must try to be more careful.
        　你可要多加小心。
        I tried gardening but didn't succeed.
        我试着种果木花卉，但未成功。