核心问题
I'll do it myself, if you won't. (LDCE)
I can do it by myself. (ALD)
请问 myself 与 by myself 有何区别。
词典解答
myself是指“我亲自”“我自己”。I'll do it myself. 强调“我自己来干。”，而不是由别人来干。by myself 是指“独自”“没有别人帮助”。I can do it by myself. 强调“不用别人帮忙，自己就能干这件事。”请对比下列例句：
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I saw him do it himself. (Eckersley) 我看到他亲自做这件事。
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We will lead the discussion ourselves. 我们将自己来组织这次讨论会。
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John claimed to have done the work by himself, but I know his brother helped him. 约翰声称这件工作是他自己干的，但是我知道他哥哥帮助了他。
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I carried it all by myself. (LDCE) 这个东西是我一个人搬来的。