1 (used before adjectives and adverbs) more than is good, allowed, possible, etc （用于形容词和副词前）太，过于: These boots are too small. 这双靴子太小了。It's far too cold to go out without a coat. 天太冷了，不穿外套不能出去。It's too long a journey for you to make alone. 路程太远了，你不能单独去。

2 (not with negative statements 不用于否定句) in addition; also 又；也；还: Red is my favourite colour but I like blue, too. 红色是我最喜欢的颜色，但我也喜欢蓝色。Phil thinks you're right and I do too. 菲尔认为你对，我也这样想。 ☞Notice that at the end of a clause you use too for agreement with positive statements and either for agreement with negative statements I like eating out and Rakesh does too. I don't like cooking and Rakesh doesn't either. 肯定句中表示有同感用too，置于分句末尾，否定句中表示有同感用either：I like eating out and Rakesh does too.我喜欢上馆子，雷克什也是。·I don't like cooking and Rakesh doesn't either.我不爱做饭，雷克什也是。

3 used to add sth which makes a situation even worse （用于补充说明更糟糕的情况）而且，更甚的是: Her purse was stolen. And on her birthday too. 她的钱包给人偷了，是在她生日那天。

4 (usually used in negative sentences 通常用于否定句) very 非常: The weather is not too bad. 天气不太坏。