Bye! Be sure to drop us a line.

再见！别忘记来个信儿。

I will. Bye.

我会的。再见。

It was really great seeing you.

见到你真的很髙兴。

Same here. Be sure to drop us a line.

我也是。别忘记来个信儿。

重点讲解:

Don't forget to write a letter to me.

Be sure to drop us a line.

和友人道别时，通常会说保持联系、记得写信之类的话，学校教的一般都是Don't forget to write a letter to me.而老外则会说Be sure to drop us a line.这种说 法更简洁，也更地道。drop sb. a line是一个习语，意思是“写信给某人” 。