I must cultivate you must cultivate she must cultivate we must cultivate you must cultivate they must cultivate
V-ing form
I must be cultivating you must be cultivating she must be cultivating we must be cultivating you must be cultivating they must be cultivating
Perfect
I must have cultivated you must have cultivated she must have cultivated we must have cultivated you must have cultivated they must have cultivated
V-ing perfect
I must have been cultivating you must have been cultivating she must have been cultivating we must have been cultivating you must have been cultivating they must have been cultivating
Negation
Simple form
I must not cultivate you must not cultivate she must not cultivate we must not cultivate you must not cultivate they must not cultivate
V-ing form
I must not be cultivating you must not be cultivating she must not be cultivating we must not be cultivating you must not be cultivating they must not be cultivating
Perfect
I must not have cultivated you must not have cultivated she must not have cultivated we must not have cultivated you must not have cultivated they must not have cultivated
V-ing perfect
I must not have been cultivating you must not have been cultivating she must not have been cultivating we must not have been cultivating you must not have been cultivating they must not have been cultivating
Interrogative form
Simple form
must I cultivate? must you cultivate? must she cultivate? must we cultivate? must you cultivate? must they cultivate?
V-ing form
must I be cultivating? must you be cultivating? must she be cultivating? must we be cultivating? must you be cultivating? must they be cultivating?
Perfect
must I have cultivated? must you have cultivated? must she have cultivated? must we have cultivated? must you have cultivated? must they have cultivated?
V-ing perfect
must I have been cultivating? must you have been cultivating? must she have been cultivating? must we have been cultivating? must you have been cultivating? must they have been cultivating?
Interro-negative form
Simple form
must I not cultivate? must you not cultivate? must she not cultivate? must we not cultivate? must you not cultivate? must they not cultivate?
V-ing form
must I not be cultivating? must you not be cultivating? must she not be cultivating? must we not be cultivating? must you not be cultivating? must they not be cultivating?
Perfect
must I not have cultivated? must you not have cultivated? must she not have cultivated? must we not have cultivated? must you not have cultivated? must they not have cultivated?
V-ing perfect
must I not have been cultivating? must you not have been cultivating? must she not have been cultivating? must we not have been cultivating? must you not have been cultivating? must they not have been cultivating?