I could generate you could generate she could generate we could generate you could generate they could generate
V-ing form
I could be generating you could be generating she could be generating we could be generating you could be generating they could be generating
Perfect
I could have generated you could have generated she 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 she 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 she 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 she 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 she 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 she 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 she generate? could we generate? could you generate? could they generate?
V-ing form
could I be generating? could you be generating? could she be generating? could we be generating? could you be generating? could they be generating?
Perfect
could I have generated? could you have generated? could she 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 she 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 she 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 she 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 she 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 she have been generating? couldn't we have been generating? couldn't you have been generating? couldn't they have been generating?