SHE IS BY HERSELF的BY HERSELF是什么成分?

SHE IS BY HERSELF的BY HERSELF是什么成分? she is too__(weak strong )to walk home by herself 改错：The clothes she wears is made by herself. she built herself为什么不加by,不加by此时的herself是什么用法 herself 与by herself的区别 by,the,she,bag,carried,herself she will finish the work [herself]为什么不是by herself She doesher homework every day.改为被动语态在百度上搜到的怎么是by herself?应该是by herself吧? She can do things by herself.She is a very i_______麻烦了各位 Mary is hardworking so she can make a l____ by herself.有没有make a life的? My siter is too young.she can't put on her clothes by herself的同义句 she is disabled,but she tries her best to do everything herself这个句子中,为什么 不是by herself而只是herself? the little girl can get d------ by herself.she is 10 years old She (is afraid) (to crossing) the road (by) herself.单句找错并改错 The little girl is six years old,but she can get d_____ by herself. Mary is hardworking so she can make a l___ by herself what w___ me is how she will get over difficulties by herself 关于英语短文翻译：she is afraid to go into dark rooms by herself.