作业帮policy,difficulty是不可数?
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policy,difficulty是不可数?
policy,difficulty是不可数?
policy,difficulty是不可数?
你好~
可以是单数也可以是复数
policy的名词复数是policies
difficulty的名词复数是difficulties
附：
抽象名词的数
抽象名词大多是不可数的,不能计数,因而没有单、复数之分.例如：
Honesty is the best policy.
Knowledge is strength.
但也有一些抽象名词是可数的,如victory, a victory, two victories; conference, a conference, several conferences.还有一些抽象名词可以复数形式出现,但不能计数.例如difficulty, difficulties; opinion, opinions.
还有一些抽象名词有复数与非复数两种形式,但表示不同的意义.以experience一词为例：当experience作“经验”解时,它没有复数,但作“经历”解时,两种形式均可.例如：
The salesman met once a week to exchange experience（经验）.
Please tell us about your experiences（经历）in Africa.
有些抽象名词表示抽象概念是不可数名词,而表示具体事物则是可数名词.例如relation作“关系”解是不可数名词,而作“亲戚”解则是可数名词；Youth作“青春”、“青年”（集合体）解是不可数名词,而作“男青年”解则是可数名词；worry作“忧愁”、“烦恼”解是不可数名词,而作“烦恼事”解则是可数名词.
有些抽象名词本身没有复数形式,如果要计数,就得用在语义上与之对应的个体名词.例如：
抽象名词 个体名词
laughter laugh
work job
correspondence（通信）letter, note, ect.
photography photo
permission permit
music song
fun joy
homework exercise
英语中还有少数几个名词,如family, room, mouth, ear,等,似乎只能是可数名词,但实际上这类名词在某些搭配中也可表示抽象概念,从而成为不可数名词,例如to have too much family (=too heavy family burden), to have too much winter (= a too long spell of cold weather); to have too much mouth (= to talk too much), to have too little ear (= to be not inclined to listen to others), to have room for (=to have a need for), to feel the patriot rise... (=to feel the patriotic feelings rise...)等.
英语中还有一些名词（大多是指人的名词）,通常作可数名词,但在特殊的搭配中表示人的特质等抽象意义时便成了不可数名词.例如fool本属可数名词,但在to be fool enough (=to be foolish enough), more of a fool (=more foolish), as much of a fool as (=as foolish as), too much of a fool (too foolish) 等搭配中,便表示抽象意义,成为不可数名词.类似的名词还有man,coward, poet, politician, sportsman, scholar 等.例如：
He was enough of a man to tell the truth.
上述这类现象只限于少数名词用在特殊的搭配中.
希望对你有帮助