Dear Nick,
This is just a short note to tell you. I'm arriving at the airport at 5 pm on Saturday, 10th December. I've been very busy recently, and that's why I haven't written to you for a while. I have planned this trip for months, so now I look forward to spending some time with you and your family. I hope you will be able to meet me at the airport. Please give my love to your wife and the children.
See you soon,
James
__________________________________
1) am arriving
2) have been
3) haven't written
4) have planned
5) look forward
6) hope