英语中可数名词与不可数名词没有绝对界限.对某个名词来说,更多的是作可数名词或不可数名词.一般来讲,抽象名词如encouragement responsibility等一般做不可数名词,表示抽象意义,但抽象名词的意义如果被具体化了,那它就变成了可数名词.如：The teachers' words were a great encouragement to him. It is a responsibility for me to ensure your safety.
encouragement responsibility有没有复数形式?有的话请写一下