must foul
Regular verb: foul - fouled- fouled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must foul
you must foul
she must foul
we must foul
you must foul
they must foul 	I must be fouling
you must be fouling
she must be fouling
we must be fouling
you must be fouling
they must be fouling	I must have fouled
you must have fouled
she must have fouled
we must have fouled
you must have fouled
they must have fouled	I must have been fouling
you must have been fouling
she must have been fouling
we must have been fouling
you must have been fouling
they must have been fouling	

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

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