Learner's definition of TOO
1
usually used at the end of a sentence or clause : in addition : also还；也 -
We are selling the house and the furniture too.我们正在出售房屋，还有家具。
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He saw something, and she saw it too.他看见了什么东西，她也看见了。
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“I'm hungry.” “Me too.”“我饿了。”“我也是。”
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I want to go too!我也想去！
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My new girlfriend is funny and pretty—and rich too. [=besides]我的新女朋友风趣又漂亮——而且还富有。
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often used for emphasis常用于强调 -
He lost his job—and right after he bought a house too.他没了工作—而且还就在他刚刚买下房子之后。
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We decided not to go out that night. And it was a good thing too, because we had a big snowstorm.我们那晚决定不出去了。那可是明智的决定，因为正赶上大暴风雪。
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He finally proposed to her. It's about time too.他终于向她求婚了。早就该这样了。
2
always used before an adjective or adverb : more than what is wanted, needed, acceptable, possible, etc.太；过于 -
The soup is too hot.这汤太烫了。
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The offer was too good to refuse.这个提议太好了，让人难以拒绝。
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This shirt is way/much too big for me.这件衬衫对我来说太大了。
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I'm too old for rock concerts. = I'm too old to go to rock concerts.我年龄太大已不适合去听摇滚音乐会了。
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She is much/far too young to be watching this movie.她还太小，不能看这部电影。
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Thank you for your donation. You are too kind. [=you are very kind]谢谢你的捐赠，你真是太好了。
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You gave me too many cards.你给了我太多的卡。
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I have too much to do.我有太多的事情要做。
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He works much too hard.他工作太辛苦了。
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You work too slowly.你活儿干得太慢了。
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Slow down. You're talking too fast.慢一点，你说得太快了。
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Don't stay too long.别待太久了。
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It's too late to do anything about it now.现在做什么都太迟了。
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Her efforts to improve her grade were too little, too late. [=her efforts were not enough and not soon enough to make a difference]她为提高成绩所做的努力太少也太迟了。
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She knew all/only too well [=unfortunately, she knew very well] what the punishment would be.不幸的是，她十分清楚会有怎样的惩罚。
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This kind of mistake happens all too often. [=happens more often than it should]这种错误发生得太频繁了。
— see also too bad at 1bad, too much at 1much 3
always used before an adjective or adverb : to a high degree or extent : very or extremely很；十分；非常 —
used in negative statements用于否定句 -
I'm not too [=so] sure that he's right. [=I think he may be wrong]我不大确定他是对的。
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The climb up the mountain was not too hard.爬山不是很难。
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The students didn't seem too interested.学生们似乎不是很感兴趣。
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She's not doing too well.她做得不是很好。
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He doesn't seem too upset.他似乎不是很苦恼。
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It is not too cold outside.外面不是很冷。
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He was none too pleased [=he was not pleased] to hear that I didn't do what he asked.听到我没有按他要求的去做，他不太高兴。
4
chiefly US, informal : most certainly确实；的确 -
“You're not strong enough to lift that box.” “I am too.” [=I am so; yes, I am]“你的力气不够，举不起那个盒子。”“我力气真的够大。”
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“I didn't do it.” “You did too.” [=yes, you did (do it)]“我没做。”“你确实做了。”
◊ Do not confuse too with to or two.