Happy Christmas!

祝你圣诞快乐！

A merry Christmas and a happy New Year!

祝你圣诞愉快，新年快乐！

Please send my Christmas greetings to Susan.

请代我向苏珊表达我的圣诞祝愿！

Thanks. The same to you.

谢谢你，也祝你圣诞快乐！