find the mistake:
I asked Hala what she was doing since I last phoned

هل احول الرابط since الى when
ام اغير زمن الجمله الاولى فتصبح what she had been doing
???????

what she had been doing
لأنى اعتقد ان since مع المضارع التام او المضارع التام المستمر

what she had been doing
لأنى اعتقد ان since مع المضارع التام او المضارع التام المستمر

هل لو استخدمت when تكون الجمله صحيحه؟