1.
a lot of 一般j即可以接 可数 也可以 不可数名词 谓语看接的什么 如果是可数名词复数 则谓语用复数 反之则单
eg1. A lot of people are waiting for the bus.
eg2. A lot of money lies on the ground.
2.
a number of 只一般接可数名词复数 谓语用复
eg3. A number of people are waiting for the bus.
3.
而 a great deal,a plenty of后一般接 不可数名词 谓语用单数
eg4.A great deal/a plenty of money lies on the ground.
个人意见 仅供参考 望有帮助!