lots of等于a lot of,
并且只能用于肯定句中；lots of既可修饰可数名词复数，也可修饰不可数名词。例如：
There are lots of trees on the hill.山上有许多树。
We have lots of vegetables every day.我们每天都吃许多蔬菜。
a lot“许多”，在句中作状语。如：
We learned a lot on the farm.在农场我们学到了许多（东西）。many修饰复数可数名词，表许多； much修饰不可数名词，表量或程度。
He has many friends, but few true ones.
There hasn't been much good weather recently.
（2）many a:
many a和many同义，但语气比较强，并且要与单数名词及单数形动词连用。
Many a prisoner has been set free. (=Many prisoners have been set free.)
〔3〕as many和so many均等于the same number of。 前有as, like时, 只用so many。
These are not all the books I have. These are as many more upstairs.
They worked like so many ants.
（4）as much等于the same amount of, 表同量和同一事情。
He bought two pounds of sugar and as much tea. 〔同量）
I was not in the least surprised, for I had fully expected as much. 〔同一事情）
（5）many和much之后不接名词时，作为代名词；另外much也可用副词。
Many of them were very tired.
I don't eat much for lunch. 〔代名词）
He is much taller than I. （副词）参考资料：
http://www.syzx.sdedu.net/xueke/english/new_page_many.htmplenty [5plenti]
n.
丰富, 充分, 大量
years of peace and plenty
太平丰收年
There is plenty of room in my bag.
我包里还很空。
There are plenty of men out of work.
有很多人失业。
We have plenty of time to finish the job.
我们有充裕的时间完成这项工作。
plenty
[5plenti]
adj.
[常用作表语]很多的, 足够的
This is plenty.
这就足够了。
plenty
[5plenti]
adv.
(=quite) 完全, 十分
plenty good enough
足够好的了
【说明】plenty只用于陈述句, 在疑问句或在否定句中一般用 enough 如: We have plenty of food for the holiday. Have you enough food for the holiday? We have not enough food for holiday.
in plenty
很多
处于优裕环境之中, (过)优裕的生活
P-is no plague.
[谚]多多益善。
plenty more
还有很多, 大量的