母亲节快乐的英语是Happy Mother's Day!

英式音标：

[ˈhæpɪ] [ˈmʌðə(r)z] [deɪ]

美式音标：

[ˈhæpɪ] [ˈmʌðərz] [de]

例句：

I wish you a happy Mother's Day!

祝您母亲节快乐!