plenty

1.There is plenty of food in the kitchen里当然用is。There are plenty of books on the shelf里该用are，不用is。plenty前面加上a的用法现在已经过时了。

2.plenty只用在肯定句里，在疑问句和否定句里通常用enough，比较下面三句：

• We have plenty of food for the holidays.
• Have you enough（不用plenty of）food for the holidays?
• We have not enough food for the holidays.

3.Good literature is plenty和Good books are plenty里的plenty用作表语形容词，现在在英国远不及在美国普通。There is plenty good literature和There are plenty good books里的plenty用作定语形容词，不很普通，最好把它改作plentiful。There is good literature plenty和There are good books plenty里的plenty用作形容词，修饰它前面的名词，不算正当，该在它的前面加上in。