核心问题
（1）I can dance and sing too.
(2) John also plays the guitar.
too 和 also 在作“也”“还”解时有何区别？
词典解答
too 和 also 虽然都可作“也”，“还”解，但 too 在口语中用得比较普遍。另一个区别，是它们在句中的位置不同。also 最常见的位置是在实义动词之前，助动词或连系动词之后，在美国英语中有时也可放在句末，见 also。too 的最常见位置是在句末，有时也放在它所指向的词语之后，但不能直接放在助动词或连系动词之后（× I am too Japanese.）。
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My husband likes cycling, and I do, too. 我丈夫喜欢骑自行车，我也喜欢。
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His father used to hit his mother, and sometimes the children too. 他爸爸过去常常打他妈妈，有时候也打孩子们。
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We, too, are going away. 我们也要离开。
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He realized that she too was strained. 他意识到她也很紧张。
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She, too, comes from Scotland. (or: She comes from Scotland too.) 她也来自苏格兰。too/either 见 either/too
too anxious
too anxious 见 too ready
too apt 见 too ready
too eager 见 too ready
too glad 见 too ready
too much/much too 见 much too