1.too 用於肯定句句末，前有逗號；as well用於肯定句句末，前無逗號；also用於句中；either用於否定句句末
E.g. Tom did it well. I did it well, too
=I did it well as well. = I also did it well.
Tom didn’t do it well, I didn’t do it well either.
2.省略形式
E.g. Tom did it well. Me, too.（注意用賓格）
Tom didn’t do it well. Me either.
3.倒裝形式 用“So+be動詞/情態動詞/助動詞+主語”表示（用於肯定句）； “Neither/Nor+be動詞/情態詞/助動詞+主語”表示（用於否定句）
E.g. Tom did it well. So did I. Tom is good at basketball. So am I
Tom can play football well. So can I
Tom didn’t do it well. Neither/Nor did I.
Tom isn’t good at basketball. Neither/Nor am I.
Tom can’t play football well. Neither/Nor can I.
4.辨析句型“So+主語+be動詞/情態動詞/助動詞”（表示確實）
Tom did it well. So he did. Tom is good at basketball. So he is.
Tom can play football well. So he can.
PS:前後兩句的主語發生了變化，用也的句型；前後主語未發生變化，用確實的句型。
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