by حرف جر تستخدم على انها بمعنى before
وهى من الكلمات التى تستخدم فى الازمنة التامة
وبالنالى اجابات المستر احمد صح تماما مع ملاحطة ان الجمل لابد ان تكون فى المينى للمجهول
my flat was painted in1999---past simple
my flat had been painted by 1999--past perfect
my flat will be painted in 2020---future simple
my flat will have been painted by 2020---future perfect tense
وان كنت اختلف من المسر على لانى لا اعتقد ان المعى المقصود هو ذلك والا اكمل
the flat was painted by 1999 worker
and I think this wouldn't be reasonable
All in all the sentences are a great way to use to make the students distinguish between the tenses
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