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我有三个句子不懂,请判断句中名词的数的用对还是错.

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我有三个句子不懂,请判断句中名词的数的用对还是错.
1.I have seven-day holiday.( )
2.I have a seven days'holiday.( )
i.I have seven days holiday.( )
若我把2句改为I have seven days'holiday,那么2句中的seven days'holiday岂不是和3句I have seven days holiday中的seven days holiday一样了吗?
我有三个句子不懂,请判断句中名词的数的用对还是错.
1.I have seven-day holiday.(错)
2.I have a seven days'holiday.(错)
i.I have seven days holiday.(对)
有连字符-时,看作一个单数,前面要加冠词I have a seven-day holiday.
没有连字符时,超过一天就要用复数形式I have seven days holiday