If you have time around Christmas, please come to visit my family.

如果你圣诞节前后有空，欢迎到我家来玩。

I'd like to cash this check.

我想兑现这张支票。

Are you being waited on?

您需要服务吗？

Have you anything dutiable?

您有应缴税的东西吗？

I would be interested in a ten-day trip around Christmas time.

我有兴趣在圣诞节前后去玩10天。

By all means, you ahead.

当然可以。随便。