audience:称作集体名词，当单形集体名词被看作一个整体时，具有单数概念；被看作若干个个体时，具有复数概念。像这样的名词有：family, government, class, staff等.
a.His family is a big one in our city.
b.His family are very friendly to us.
c.The audience is quiet when the concert is on.
d.The audience like Harry portter very much.
看作一个整体时，后面往往是对整体性质的说明，以be动词最具代表性。
看作若干个个体时，后面往往是个体的动作，或是带有个人感情的词。
从上面两组例子应该不难体会到他们的区别。
