9. It is very nice of you to come and see me off.
您来给我送行真是太客气了。
还能这样说：
You are so nice to send me off.
You are so kind to see me off.
谚语：
To see is to believe.
眼见为实。
10. Goodbye and have a good flight.
再见，祝你一路顺风。
还能这样说：
Goodbye and I wish you a very good journey.
Goodbye and all the best.
应用解析：
a flight of ambition 雄心勃勃；
a flight of fancy 想入非非，异想天开；
in flight 在飞行中；
in flight from 逃避，逃开；
in the top flight 居首要地位；领先；
make a flight 飞去；迅速离开
11. Please give my best regards to your family.
请向你的家人转达我的问候。
还能这样说：
Please convey your family my best regards.
Please express my best wishes to your family.
应用解析：
as regards 关于，至于；
have high regard for 极为尊敬；重视；
in regard of 关于；
out of regard for 出于对……的考虑；
pay regard to sb. 尊重某人；注重到某人
12. I'm afraid I must be off.
恐怕我得走了。
还能这样说：
I'd better be going now.
It's about time I am going.
应用解析：
far off 远；
get off 脱衣；下马；
fall off （从马上）掉下来；下降，跌落
look off 掉转视线
13. Drop in again when you are free.
有空再来啊。
还能这样说：
Please call on me whenever you have time.
Just pay a short visit if you have time at any time.
谚语：
There's no such thing as free lunch.
天下没有免费的午餐。
14. Take your time.
请慢走。
还能这样说：
Take care.
Mind your steps.
15. Remember me to your parents.
代我向你父母问好。
还能这样说：
Best wishes to your parents.
Mention me to your parents.
应用解析：
remember of 记得，想起；
remember oneself 恢复镇定；仔细地想一想；反省；
remember one to sb. 代向某人致意
16. The time will come and I must say good-bye.
我不久将向大家告别。
还能这样说：
I have to leave soon.
I'll take leave in a short time.
应用解析：
at any time 随时；无论何时；
at no time 永不，在任何时候都不；
at one's time of life 在这个年纪