many youths like to hold parties on the day or go to bars to enjoy themslves in two and threes.in two and threes.为什么threes有s啊,two没有啊

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many youths like to hold parties on the day or go to bars to enjoy themslves in two and threes.
in two and threes.为什么threes有s啊,two没有啊

楼主!
two-and-three 表示2人一组或3人一组 加s 表示对组的复数
有结伴而行的意思.

two后面是要加“s”,in twos and threes就是三三两两的意思