9.3.3.1 Formazione del past perfect continuous


esempio          
to have (past) + participio perfetto    
= past perfect
+ Verbo pieno
 + suffissoo -ing = past perfecto continuous  
he had been
do
ing he had been doing
she had been
writ(e)
ing she had been writing
we had been
jump
ing we had been jumping
they had been
sell
ing they had been selling
you had been
study
ing you had been studying
I had been
watch
ing I had been watching





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