I must irrigate you must irrigate she must irrigate we must irrigate you must irrigate they must irrigate
V-ing form
I must be irrigating you must be irrigating she must be irrigating we must be irrigating you must be irrigating they must be irrigating
Perfect
I must have irrigated you must have irrigated she must have irrigated we must have irrigated you must have irrigated they must have irrigated
V-ing perfect
I must have been irrigating you must have been irrigating she must have been irrigating we must have been irrigating you must have been irrigating they must have been irrigating
Negation
Simple form
I must not irrigate you must not irrigate she must not irrigate we must not irrigate you must not irrigate they must not irrigate
V-ing form
I must not be irrigating you must not be irrigating she must not be irrigating we must not be irrigating you must not be irrigating they must not be irrigating
Perfect
I must not have irrigated you must not have irrigated she must not have irrigated we must not have irrigated you must not have irrigated they must not have irrigated
V-ing perfect
I must not have been irrigating you must not have been irrigating she must not have been irrigating we must not have been irrigating you must not have been irrigating they must not have been irrigating
Interrogative form
Simple form
must I irrigate? must you irrigate? must she irrigate? must we irrigate? must you irrigate? must they irrigate?
V-ing form
must I be irrigating? must you be irrigating? must she be irrigating? must we be irrigating? must you be irrigating? must they be irrigating?
Perfect
must I have irrigated? must you have irrigated? must she have irrigated? must we have irrigated? must you have irrigated? must they have irrigated?
V-ing perfect
must I have been irrigating? must you have been irrigating? must she have been irrigating? must we have been irrigating? must you have been irrigating? must they have been irrigating?
Interro-negative form
Simple form
must I not irrigate? must you not irrigate? must she not irrigate? must we not irrigate? must you not irrigate? must they not irrigate?
V-ing form
must I not be irrigating? must you not be irrigating? must she not be irrigating? must we not be irrigating? must you not be irrigating? must they not be irrigating?
Perfect
must I not have irrigated? must you not have irrigated? must she not have irrigated? must we not have irrigated? must you not have irrigated? must they not have irrigated?
V-ing perfect
must I not have been irrigating? must you not have been irrigating? must she not have been irrigating? must we not have been irrigating? must you not have been irrigating? must they not have been irrigating?