When is Mother's Day?It's on the second Sunday in May.用on 语法有错误吗

问题描述:

When is Mother's Day?It's on the second Sunday in May.用on 语法有错误吗

如果具体到天的话就用on,如果只有月或年就用in,你这里已经具体到第二个星期天,所以用on没有错,不过前半句改成这个要好些:When is the Mothers' Day