بسم الله الرحمن الرحيم
المعتاد في الكتب الخارجية ان يأتي بعد since اما نقطة زمنية او ماضي بسيط كالاتي:
They've known each other since 1980
We haven't seen Jamie since Christmas
We haven't seen Jamie since we were in Luxor
و لكن في اللغة عموما الامثلة الاتية صحيحة تماما
I've known her since we were at school together
هنا : نحن لم نعد في المدرسة
I've known her since I've lived in this street
هنا : ما زلت اعيش في هذا الشارع
تقبل تحياتي