1- form:           had+p.p.
2-
Key words 
ماضي بسيط – ماضي تام  1- After / As soon as 
** After I had done my homework, I
watched TV. 
ماضي تام – ماضي بسيط 2- Before / By the time 
** Before I watched Tv, I had done
my homework.
ماضي بسيط – ماضي بسيط / ماضي تام – ماضى
بسيط 3-when 
** When I arrived at the station
the train left.
** When I arrived at the station, the train had left.
والمعنى هنا يختلف تماما .
1- I caught the train.
2- I didn`t catch it = I missed it.
     Scarcely.....................when
ولا بد أن يأتي بعدهم الماضي التام على هيئة سؤال  
** No sooner had I done my
homework than I watched Tv .
ولو كتبناهم بعد had  فلا تكون
الجملة على هيئة سؤال .
 ** I had no
sooner done my homework than I watched Tv. 
ماضي تام till / until  ماضي بسيط منفي 5- 
** I didn`t watch Tv. Unitl I had done my homework.
Notes
1- on + ing                                                                
** When the thief saw he policeman, he ran away.
On seeing the policeman, he ran away.
2- After / before + ing 
** After doing my homework, I watched TV.
** Before watching TV, I had done my homework.
had +p.p. فاعل After  = 3- Having
+p.p. 
** After I had finished my work, I
left the office.
Having finished my work, I left
the office. 
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