I could preprocess you could preprocess he could preprocess we could preprocess you could preprocess they could preprocess
V-ing form
I could be preprocessing you could be preprocessing he could be preprocessing we could be preprocessing you could be preprocessing they could be preprocessing
Perfect
I could have preprocessed you could have preprocessed he could have preprocessed we could have preprocessed you could have preprocessed they could have preprocessed
V-ing perfect
I could have been preprocessing you could have been preprocessing he could have been preprocessing we could have been preprocessing you could have been preprocessing they could have been preprocessing
Negation
Simple form
I couldn't preprocess you couldn't preprocess he couldn't preprocess we couldn't preprocess you couldn't preprocess they couldn't preprocess
V-ing form
I couldn't be preprocessing you couldn't be preprocessing he couldn't be preprocessing we couldn't be preprocessing you couldn't be preprocessing they couldn't be preprocessing
Perfect
I couldn't have preprocessed you couldn't have preprocessed he couldn't have preprocessed we couldn't have preprocessed you couldn't have preprocessed they couldn't have preprocessed
V-ing perfect
I couldn't have been preprocessing you couldn't have been preprocessing he couldn't have been preprocessing we couldn't have been preprocessing you couldn't have been preprocessing they couldn't have been preprocessing
Interrogative form
Simple form
could I preprocess? could you preprocess? could he preprocess? could we preprocess? could you preprocess? could they preprocess?
V-ing form
could I be preprocessing? could you be preprocessing? could he be preprocessing? could we be preprocessing? could you be preprocessing? could they be preprocessing?
Perfect
could I have preprocessed? could you have preprocessed? could he have preprocessed? could we have preprocessed? could you have preprocessed? could they have preprocessed?
V-ing perfect
could I have been preprocessing? could you have been preprocessing? could he have been preprocessing? could we have been preprocessing? could you have been preprocessing? could they have been preprocessing?
Interro-negative form
Simple form
couldn't I preprocess? couldn't you preprocess? couldn't he preprocess? couldn't we preprocess? couldn't you preprocess? couldn't they preprocess?
V-ing form
couldn't I be preprocessing? couldn't you be preprocessing? couldn't he be preprocessing? couldn't we be preprocessing? couldn't you be preprocessing? couldn't they be preprocessing?
Perfect
couldn't I have preprocessed? couldn't you have preprocessed? couldn't he have preprocessed? couldn't we have preprocessed? couldn't you have preprocessed? couldn't they have preprocessed?
V-ing perfect
couldn't I have been preprocessing? couldn't you have been preprocessing? couldn't he have been preprocessing? couldn't we have been preprocessing? couldn't you have been preprocessing? couldn't they have been preprocessing?