as many as possible是修饰可数名词
as much as possible是修饰不可数名词
as many as possible:
1.During the earthquake,we should save people's lives as many as possible
地震中,我们应尽可能地挽救生命
2.Please write sentences as many as possible.
请写出尽可能多的句子.（修饰可数名词）
as much as possible：
1.You should speak english as much as possible.”
你应该多说英语（修饰“英语“不可数）