An amount of后people, an amount of许多大量的意思，是用来修饰不可数名词的。
People是一个单复数同形的名词,同时也是一个可数名词,所以不能用an amount of来修饰,但可以用a large number of或者a lot of等修饰。例如an amount of money was donated to this school。一大笔钱被捐给了这所学校。A lot of people were injured in the accident。许多人在这次事故中受伤了。