英语翻译人应该用person还是people?

个人 应该用individual person 还是separate person 英语翻译5个人是five person还是five people? successful people 还是 successful person.. a great people还是 person people 应该用many people 还是much people呢? 一个人是one people 还是one person? each person 还是each people,为什么? 英语翻译people 和person加不加s person的复数是persons还是people,还是两个一样? 请问people是可数还是不可数? 是用few还是用little修饰? person是可数还是不可数? no one likes selfish person.为啥用person?people? 是this kind of people还是this kind of person,用不用把this改成these 后面