many只能修饰可数名词复数;
lots of/a lot of既可修饰可数名词,也可修饰不可数名词.
many books许多书;
There was a lot of mud on the ground.地上有许多泥.
I picked lots of flowers.我摘了许多花.
还要注意以下几点:
一般说来 many多半是用在疑问句和否定句里,而 lots of/a lot of 常用于肯定句中.
lots of/a lot of 后面接可数名词时谓语用复数,接不可数名词时,谓语用单数.
many a 也表示“许多”,但谓语用单数.