I must fumigate you must fumigate she must fumigate we must fumigate you must fumigate they must fumigate
V-ing form
I must be fumigating you must be fumigating she must be fumigating we must be fumigating you must be fumigating they must be fumigating
Perfect
I must have fumigated you must have fumigated she must have fumigated we must have fumigated you must have fumigated they must have fumigated
V-ing perfect
I must have been fumigating you must have been fumigating she must have been fumigating we must have been fumigating you must have been fumigating they must have been fumigating
Negation
Simple form
I must not fumigate you must not fumigate she must not fumigate we must not fumigate you must not fumigate they must not fumigate
V-ing form
I must not be fumigating you must not be fumigating she must not be fumigating we must not be fumigating you must not be fumigating they must not be fumigating
Perfect
I must not have fumigated you must not have fumigated she must not have fumigated we must not have fumigated you must not have fumigated they must not have fumigated
V-ing perfect
I must not have been fumigating you must not have been fumigating she must not have been fumigating we must not have been fumigating you must not have been fumigating they must not have been fumigating
Interrogative form
Simple form
must I fumigate? must you fumigate? must she fumigate? must we fumigate? must you fumigate? must they fumigate?
V-ing form
must I be fumigating? must you be fumigating? must she be fumigating? must we be fumigating? must you be fumigating? must they be fumigating?
Perfect
must I have fumigated? must you have fumigated? must she have fumigated? must we have fumigated? must you have fumigated? must they have fumigated?
V-ing perfect
must I have been fumigating? must you have been fumigating? must she have been fumigating? must we have been fumigating? must you have been fumigating? must they have been fumigating?
Interro-negative form
Simple form
must I not fumigate? must you not fumigate? must she not fumigate? must we not fumigate? must you not fumigate? must they not fumigate?
V-ing form
must I not be fumigating? must you not be fumigating? must she not be fumigating? must we not be fumigating? must you not be fumigating? must they not be fumigating?
Perfect
must I not have fumigated? must you not have fumigated? must she not have fumigated? must we not have fumigated? must you not have fumigated? must they not have fumigated?
V-ing perfect
must I not have been fumigating? must you not have been fumigating? must she not have been fumigating? must we not have been fumigating? must you not have been fumigating? must they not have been fumigating?