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 could not cultivate you could not cultivate he could not cultivate we could not cultivate you could not cultivate they could not cultivate
V-ing form
I could not be cultivating you could not be cultivating he could not be cultivating we could not be cultivating you could not be cultivating they could not be cultivating
Perfect
I could not have cultivated you could not have cultivated he could not have cultivated we could not have cultivated you could not have cultivated they could not have cultivated
V-ing perfect
I could not have been cultivating you could not have been cultivating he could not have been cultivating we could not have been cultivating you could not have been cultivating they could not 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
could I not cultivate? could you not cultivate? could he not cultivate? could we not cultivate? could you not cultivate? could they not cultivate?
V-ing form
could I not be cultivating? could you not be cultivating? could he not be cultivating? could we not be cultivating? could you not be cultivating? could they not be cultivating?
Perfect
could I not have cultivated? could you not have cultivated? could he not have cultivated? could we not have cultivated? could you not have cultivated? could they not have cultivated?
V-ing perfect
could I not have been cultivating? could you not have been cultivating? could he not have been cultivating? could we not have been cultivating? could you not have been cultivating? could they not have been cultivating?