a lot 修饰词
a lot of 修饰名词
lots of修饰数数名词
a lot 副词
：thanks a lot
a lot of能修饰数名词
a lot of=lots of 许 修饰数名词数名词
a lot表示程度词组
thanks a lot 谢
know a lot about China 解
lot非式写,说书面语用a lot of较,口语用lots of较(能）lot朋友群陌,或我认识群朋友
a lot oflots of都修饰数数名词
a lot解释非副词
且a lot of能单用lots of般‘BE词+lots of+情态词’形式现
另外lots of用平口语a lot of用于书面表达比较