determiner, pronoun & adjective
more, most
- a large number of许多（的）, 很多（的）：
as determiner many people agreed with her许多人同意她的意见
as pronoun the solution to many of our problems对我们的许多问题的解决办法
many think it is a new craze
许多人认为这是一种新热潮
as adj. one of my many errors.我的诸多错误之一。
短语
as many
- the same number of一样多的, 相同数目的：
changing his mind for the third time in as many months.
在3个月内他第三次改变了主意。
a good （或great） many
- a large number许多, 很多：
a good many of us.
我们很多人。
have one too many
- informal become slightly drunk〈非正式〉多喝了一杯（酒）; 微醉。
how many
- used to ask what a particular quantity is多少：
how many books did you sell?
你卖了多少本书？
many a -
- a large number of很多, 许多：
many a good man has been destroyed by booze.
许多好男人毁于贪杯。
many's the -
- used to indicate that something happens often经常, 常常：
many's the night he's been called out in the small hours.
他经常在凌晨被叫走。
词源
Old English manig, of Germanic origin; related to Dutch menig and German manch.