Here is a sample format for an Excuse Letter. This is often used when a child misses his or her classes due to an illness.
(Insert Date Here)
(Insert School Name)
(Insert School Address)
Dear Sir/Madame (Insert Teacher's Name):
Please excuse my son/daughter (Insert your child's name) from his/her classes last (Insert Date of Absence or Period) as he/she was ill. Kindly extend to her/him any assistance on the lessons or assignments missed during that period. Please refer to the attached medical certificate. (Include this only if he/she has one)
Hoping for your consideration and understanding. Thank you very much.
(Insert Your Signature)
(Insert Your Full Name)
Sample Authorization Letter to Pick Up an Official Document
Sample Authorization Letter to Pick Up NSO or Census Document