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theartteacherwithhisstudentsisgoingtoHKifitisn'trainytomorrow为什么要用rainy不用rains,

题目详情
the art teacher with his students is going to HK if it isn't rainy tomorrow
为什么要用rainy不用rains,
▼优质解答
答案和解析
因为前面有系动词isn't
它的同义句是:
the art teacher with his students is going to HK if it doesn't rain tomorrow