Sunday變成複數是直接加s，也就是Sundays。不可以用y->i+es的規則，因為前面不是輔音 ，Sunday是以ay字母組合進行發音的。
複數形式直接在後加s，sundays中文意思是adv. 每星期日
The art gallery waives admission charges on Sundays.
She was sacked for refusing to work on Sundays.
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