0Hi,02br 02br 00I think some selective cases, the word 'by' is optional as in these ones:02br 02br 00He did it himself/by himself.02br 02br 00He made the toy truck himself/by himself.02br 02br 00He took care of the problem himself/by himself.02br 02br 00If I am correct, then when is it not optional? 0-
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0 .02br 00They are close in meaning and hence are often practically interchangeable.02br 02br 01i00Himself -02i00- no one else did it.02br 01i00By himself02i00 -- without help.0-