2. I (start) ________ school when I was five years old. I (be) ________ at school since I (be) ________ five years old.

2. I started school when I was five years old. (Past Simple, так как действие произошло в прошлом).

I have been at school since I was five years old. (Present Perfect, так как действие началось в прошлом и продолжается до настоящего времени).