the pair of shoes (were) worn out why?

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the pair of shoes (were) worn out why?

The pair of shoes was worn out.
a pair of 是主语,单数,所以,必须是was.
The shoes were worn out.shoes
是主语,复数,所以,必须是were.

不太正确,一般来说当shoes和this(the)pair of连用后作主语看做单数。本句应为:the pair of shoes (was) worn out

不对!不能用were,应该用was,因为主语a pair 是第三人称单数

正确的!
英文解释
wear out:to become ,or make sth become,thin,or on longer able to be used,usually because it has been used too much:
例句:
He wore out two pairs of shoes last year

不对,应该用was

不对,应该用was
The pair of 单数

以上回答我认为不太全面,的确是 The pair of 是单数为主语,可是一双鞋有几只呢,如果这么想可以看作为复数形式.也看可看作是一双.为单数.