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