----Mum,I've been studying English since 8 o'clock.________

—Mum, I’ve been studying English since 8 o’clock. ________ I ----Mum,I've been studying English since 8 o'clock.________ — Mum, I’ve been studying English since 8 o’clock. _______ I —Mum,I've been studying English since 8 o'clock.( )I go out —Mum, I’ve been studying English since 8 o’clock. ____ I go — Mum, I’ve been studying English since 8 o’clock. ____ mom,i've been studying English since 8 o'clock.( ) i go out I've been studying English since 12. We've been studying English since five years ago(提问） I have been studying English since I was five (对since I was I have been studying English since I was five (对化线部分提问) I have been studying English (since i was eibht years old) (