lots of ,a lot of,a lot,plenty of有什么区别?如题

lots of ,a lot of,a lot,plenty of有什么区别?
如题

它们都有“大量的,许多的”意思.plenty of/lots of/a lot of后既可修饰可数名词复数,也可以修饰不可数 lots of＝a lot of 后面接可数名词和不可数名词均可,接可数名词时谓语用复数,接不可数名词时,谓语用单数.a lot当然不是名词性短语了,而是副词性短语,修饰动词.比如：Thanks a lot.= Thanks very much.再比如：I know him a lot.plenty of 和以上lots of 和a lot of相似,后面接可数名词和不可数名词均可,接可数名词时谓语用复数,接不可数名词时,谓语用单数.