1. 可数名词有哪些语法特点
如果一个名词是可数的，那么它就可以用不定冠词来修饰，用数词来修饰，并且可以有复数形式。如：
A tree has fallen across the road. 一株树倒下横在路上。
Our house has five rooms. 我们的房子有5个房间。
2. 可数名词有哪些常用修饰语
通常用于修饰可数名词的修饰语有some, any, many, few, a few, a lot of, lots of, plenty of, a great many, a great number of等修饰。如：
I have lived here for many years. 我在这里住了好多年了。
Remember to buy some stamps, won’t you? 记着买些邮票好吗?
Plenty of shops open on Sunday mornings. 周日上午很多商店营业。
A great many people were at the meeting. 很多人参加了会议。
A great number of our students are American. 我们的学生中有许多是美国人。
注：其中的some, any, a lot of, lots of, plenty of既可用于修饰可数名词，也可用于修饰不可数名词；而其中的many, few, a few, a great many, a great number of则只用于修饰可数名词，不用于修饰不可数名词。
3. 不可数名词有哪些语法特点
如果一个名词是不可数的，那么它就不可以用不定冠词来修饰，也不可以用数词来修饰，同时也没有复数形式。如：
夏天在海里游泳是一大乐趣。
误：Swimming in the sea is a great fun in summer.
正：Swimming in the sea is great fun in summer.
这本书包含许多有用的信息。
误：The book has a lot of useful informations.
正：The book has a lot of useful information.
4. 不可数名词有哪些常用修饰语
通常用于修饰不可数名词的修饰语有some, any, much, little, a little, a lot of, lots of, plenty of, a great deal of, an amount of, a quantity of 等修饰。如：
Save some milk for me. 给我留点牛奶。
He gives me a lot of help. 他给我许多帮助。.
A great deal of money is spent on research. 研究工作上花了许多钱。
I’m sorry to have given you so much trouble. 对不起，给你添了这么多麻烦。
注：其中的some, any, a lot of, lots of, plenty of等既可用于修饰可数名词，也可用于修饰不可数名词；而其中的much, little, a little, a great deal of, an amount of通常只用于修饰不可数名词，不用于修饰可数名词。
如果要具体表示不可数名词的数量，可用“数词+量词+of +名词”这样的形式。如：
Let me give you a piece of advice. 让我给你一个忠告。
She wrote her name and address on a sheet of paper. 她把名字和地址写在一张纸上。