I 'll return the book back as soon as I can 改错

I 'll return the book back as soon as I can 改错

这里应该把back去掉.
因为return已经有归还的意思了,再加back就重复了.
百度英语牛人团为您解答,如果帮到您了请及时采纳,

I'll return the book as soon as I can 或 I'll give the book back as soon as I can.
return 已经有“还”的意思了，不用再加一个“back”。