✔ 最佳答案
Dear Mr./Miss (staff's full name)
During 3 months of probation period, we find that your performance is good and able to reach our level. We are pleased to announce you pass the probation period and will become a permanent staff from (effective date).
**if you will revise her/his salary, you could write:
Your salary will be increased to HK$ xxx accordingly.
If you have any enquires, please inform you immediately.
Thanks!
Yours faithfully,
your name
department