How many bookshelfs are there in your room改错

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How many bookshelfs are there in your room改错

bookshelves而不是bookshelfs

bookshelfs拼错了。是bookshelves

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