by himself在句子中做什么成分?

by himself在句子中做什么成分?
The building shall be constructed by himself.
上句中的by himself 在句中做什么成分?
还有一句话“He has the ability to do the work.
变成疑问句是”Has he the ability to do the work?

y himself作状语
Has he the ability to do the work?
Does he have the ability to do the work?

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