when__(be)Tom's and Jack's birthday

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when__(be)Tom's and Jack's birthday
when__(be)Tom's and Jack's birthday

when__(be)Tom's and Jack's birthday
when are (be)Tom's and Jack's birthday
因为后面两个人名后都加了's,所以指的是Tom和Jack的生日,是不同的日子
所以用are
如果是Tom and Jack's 就用is