very ：
修饰原级形容词和副词以及完全形容词性化的现在分词或过去分词,如:tired,ashamed,exciting等
【注】
1.非形容词性化的分词不能用very修饰,可用much修饰.
eg.) She is very pleased by his words.(×)
She is much pleased by his words.(√)
2.一些不分等级的形容词不能用very修饰,可用quite (completely) 修饰.
eg.) You are very wrong.(×)
You are quite wrong.(√)
3.部分以a 开头的形容词不能用very修饰,可用 much修饰.
eg.) She was very afraid of dogs.(×)
She was much afraid of dogs.(√)
foolish不满足（2）,不能用very修饰
too：如果一句话表达不认同,很难达到的事情就用too,也就是有点否定的意思,比如：This question is too difficult.这个问题太难了（言外之意表示不容易回答）
另外还有一些特殊的,如too much,记住就行了
