1-
في المضارع present                    
                                                                         متأكد
1- Sure
= certain 
مصدر + Can`t
                         مصدر + must
e.g. He is definitely
( certainly ) clever . ( must ) 
He must be clever.
e.g. I think she isn`t
a nurse  ( can`t) 
She can`t be a nurse.
غير متأكد 2- Not
sure / possible / probable 
مصدر + may / might 
e.g. It is possible that he is at the
club. ( might ) 
He might be at the club.
e.g. It is probable that she plays tennis
. ( may ) 
 She
may play tennis.
نلاحظ :                is / are ----------- be
2- في الماضي         Sure                                                                                                         
1- must have+ p.p.                             can`t have + p.p. 
e.g. I`m sure he was at school .   ( must ) 
He must have been at school. 
e.g. I think she didn`t go to the club .
( can`t ) 
She can`t have gone to the club.
2- Not sure 
May have + p.p.        / might
have + p.p. 
e.g. Perhaps he visited Alex last year ( may ) 
He may have visited Alex last year.
نلاحظ
:   was / were---------- been 
يجب حذف الكلمات :- 
I`m sure / I`m not sure / I think / I don`t think /
definitely / certainly / perhaps /   It’s probable / It’s possible 
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