How do parents write school leave notes?

1, Dear Teacher xx: My child xxx needs to be nursed at home (must be hospitalized) because of X disease, so he can't come to school for X days. Please approve, thank you! Pay tribute to the parents of students: xx, xx, XX, XX.

2. Dear Teacher xx: XX can't come to school on time because of xxxx (for leave). I hereby ask for leave xxxx (leave time), and hope you will approve it. Thank you for your understanding and help. Salute! Parents: xx, xx, XX.