I could cultivate you could cultivate she could cultivate we could cultivate you could cultivate they could cultivate
V-ing form
I could be cultivating you could be cultivating she could be cultivating we could be cultivating you could be cultivating they could be cultivating
Perfect
I could have cultivated you could have cultivated she 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 she 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 she 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 she 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 she 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 she 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 she cultivate? could we cultivate? could you cultivate? could they cultivate?
V-ing form
could I be cultivating? could you be cultivating? could she be cultivating? could we be cultivating? could you be cultivating? could they be cultivating?
Perfect
could I have cultivated? could you have cultivated? could she 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 she 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 she 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 she 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 she 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 she have been cultivating? couldn't we have been cultivating? couldn't you have been cultivating? couldn't they have been cultivating?