I have a lot of old coins(金币).

多种回答：
如：lots of
many
a great/large number of
a large amount of
lots and lots of
etc.
分析如下：就与lot 相关
A lot of 可修饰不可数名词和可数名词.
e.g.I've got an awful lot of work to do before I go on holiday.（work 不可数）
There are a lot of people talking in the park.(people,人,单复同形 可数)
Lots of 修饰不可数名词和可数名词的复数形式
e.g.There are lots [a lot] of people coming许多人.
lots and lots (of) 许许多多=a large amount,or a large number of people or things (takes a singular or plural verb)
• Lots of exercise is what you need.（不可数,练习）
• You have lots of choices.(可数,复数形式,选择)
Lot 做副词用或与a 搭配做副词用以修饰
Adv：to a great extent or degree = much
e.g.• I'm feeling lots better,thanks.
often or much of the time=often
e.g.went out to restaurants a lot
• I learned a lot.

a lot of 许许多多的
many 许多的
所以是 many~

many
coins 是可数名词

many