by oneself 好像总是用作状语。例如:
He sat by himself. 他独自坐着。
She lives by herself. 她独自一个人生活。
She can mend the fridge by herself. 她能自己修理冰箱。
请问老师:by oneself 可以用作表语吗?例如:
He is by himself. 他是一个人。
by oneself可以用作表语。如:
He was by himself, alone, as ever. 他独自一人,一如往常。《柯林斯高阶英语词典》
My mother is by herself, hence I must go home now. 我妈一个人在家,因此我得回家了。《张道真英语语法》