问题补充：
holiday在什么用复数什么时候用单数? 英语
答案：
【答案】 holiday是指“节假日”.较短的节假日一般用单数,较长的节假日单复数均可.
Sunday is a holiday.
The summer holidays begin.
They had a five day’s holiday.
They had a five-day holiday.
They had a holiday of five days.
搭配一：for holiday 度假
A French student went to London for his holiday.
搭配二：on holiday 正在休假
She is on holiday in France.
[注意]表示放多少天假时,只能用 “a holiday of … days”, “…days’ holiday”或 “…day holiday”.
This summer we have 50 days’ holidays.
This summer we have a holiday of 50 (days).
搭配三：have/take/spend a holiday 度假
I spent my holiday in the village.
