Definition: from a time in the past until a later time or until now Level: B2
自从我有了新自行车，我每天都骑车上学。
I ride my bike to school every day ___since I got my new bicycle.
她一直是我的好朋友，自从我们上小学就认识了。
She has been my good friend ___since we were in primary school.
