为什么"have a nice weekend!"与"on weekends"的"weekend" 一个加s一个不加s?

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为什么"haveaniceweekend!"与"onweekends"的"weekend"一个加s一个不加s?为什么"haveaniceweekend!"与"onweekends"的"weekend"

为什么"have a nice weekend!"与"on weekends"的"weekend" 一个加s一个不加s?
为什么"have a nice weekend!"与"on weekends"的"weekend" 一个加s一个不加s?

为什么"have a nice weekend!"与"on weekends"的"weekend" 一个加s一个不加s?
have a nice weekend前面有冠词a,
所以只能不加s;
on weekends前面没有冠词来特指是哪一个周末
只是一个范围,所以加s

have a nice weekend前面有冠词a,
所以只能不加s;
on weekends前面没有冠词来特指是哪一个周末
只是一个范围，所以加s

weekend指一个周末
on weekends 指“各个周末”

have a nice weekend是一个固定用法，又因为weekend是可数的，所以不加s
如：have a good time\have a nice day都是过得愉快的意思。
on weekends 是每逢周末的意思，那么就不止一个周某末，所以要加s
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