to myself和by myself和for myself分别是什么意思要有把握才能回答哟

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to myself－”对我自己”
e.g.I talk to myself.我对自己说．
by myself－”自己一个人做”
e.g.I did the homework by meself.我是自己做的作业．
for meself－”为自己”
e.g.I bought a dress for myself.我给自己买了件裙子．