How many bookshelfs are there in your room改错

问题描述:

How many bookshelfs are there in your room改错

bookshelves
大部分结尾f 的名词复数的话,如wolf,要改成 ves
但也有例外,比如roof就不能用

bookshelfs拼错了。是bookshelves

bookshelves而不是bookshelfs