a lots of?没有这个说法,只有lots of,lots of=a lot of=much=many,都表 '很多' 的意思,只不过后面跟的不同：
lots of与a lot of都可以修饰可数与不可数名词,eg:there're lots of / a lot of students.
there is a lot of / lots of bread
much用来修饰不可数名词,eg:there is much milk
many修饰可数名词复数,eg:many students love playing basketball
a lot 一般是用来表程度的啦 eg:i love this book a lot