副词 “enough” 可以指 “物体数量充足，足够地，十分”；“too” 作副词使用时可以指 “某物或人太...，过于...”。在使用中，人们多用 “enough” 来谈论好事，而用 “too” 来谈论不好的事情。
 
Hi, I'm Tim. And I'm going to tell you the difference between too and enough when we use them as adverbs.
They refer to quantity but there's an important difference.
Enough is usually positive. It means that something is 'suitable' or 'sufficient'. Great! This T-shirt is big enough. It'll fit me perfectly. It's colourful enough for my sister's party!
Too usually has a negative meaning. It's used to say that something is 'a problem' or it's 'unsuitable' in some way. Oh, no! This is too short! I can't wear this! It's too late to find anything else to wear.
So, if we have enough, it's probably a good thing, but if you see too, it's a bad thing.
Remember, if something is too good to be true, it probably isn't. Unless it's believable enough, then it probably is!
 
用法总结
1 副词 “enough” 的意思包括 “数量充足，足够地，十分”，通常用在积极的语境中谈论好事，尤指某物的特定属性很合适或足以让人满意。
This T-shirt is big enough for me to wear.
There's enough food for everyone to eat. Pleace come in!
 
2 “Too” 作副词使用时的意思是 “某物或人太...，过于...”，通常用在负面的语境中谈论坏事，尤指某事物有问题或不合适。
This is too short. I can't wear this.
There were too many people at the party.