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