I must foul you must foul he must foul we must foul you must foul they must foul
V-ing form
I must be fouling you must be fouling he must be fouling we must be fouling you must be fouling they must be fouling
Perfect
I must have fouled you must have fouled he must have fouled we must have fouled you must have fouled they must have fouled
V-ing perfect
I must have been fouling you must have been fouling he must have been fouling we must have been fouling you must have been fouling they must have been fouling
Negation
Simple form
I must not foul you must not foul he must not foul we must not foul you must not foul they must not foul
V-ing form
I must not be fouling you must not be fouling he must not be fouling we must not be fouling you must not be fouling they must not be fouling
Perfect
I must not have fouled you must not have fouled he must not have fouled we must not have fouled you must not have fouled they must not have fouled
V-ing perfect
I must not have been fouling you must not have been fouling he must not have been fouling we must not have been fouling you must not have been fouling they must not have been fouling
Interrogative form
Simple form
must I foul? must you foul? must he foul? must we foul? must you foul? must they foul?
V-ing form
must I be fouling? must you be fouling? must he be fouling? must we be fouling? must you be fouling? must they be fouling?
Perfect
must I have fouled? must you have fouled? must he have fouled? must we have fouled? must you have fouled? must they have fouled?
V-ing perfect
must I have been fouling? must you have been fouling? must he have been fouling? must we have been fouling? must you have been fouling? must they have been fouling?
Interro-negative form
Simple form
must I not foul? must you not foul? must he not foul? must we not foul? must you not foul? must they not foul?
V-ing form
must I not be fouling? must you not be fouling? must he not be fouling? must we not be fouling? must you not be fouling? must they not be fouling?
Perfect
must I not have fouled? must you not have fouled? must he not have fouled? must we not have fouled? must you not have fouled? must they not have fouled?
V-ing perfect
must I not have been fouling? must you not have been fouling? must he not have been fouling? must we not have been fouling? must you not have been fouling? must they not have been fouling?