must fog
Regular verb: fog - fogged- fogged

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must fog
you must fog
he must fog
we must fog
you must fog
they must fog 	I must be fogging
you must be fogging
he must be fogging
we must be fogging
you must be fogging
they must be fogging	I must have fogged
you must have fogged
he must have fogged
we must have fogged
you must have fogged
they must have fogged	I must have been fogging
you must have been fogging
he must have been fogging
we must have been fogging
you must have been fogging
they must have been fogging	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not fog
you must not fog
he must not fog
we must not fog
you must not fog
they must not fog 	I must not be fogging
you must not be fogging
he must not be fogging
we must not be fogging
you must not be fogging
they must not be fogging	I must not have fogged
you must not have fogged
he must not have fogged
we must not have fogged
you must not have fogged
they must not have fogged	I must not have been fogging
you must not have been fogging
he must not have been fogging
we must not have been fogging
you must not have been fogging
they must not have been fogging	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I fog?
must you fog?
must he fog?
must we fog?
must you fog?
must they fog? 	must I be fogging?
must you be fogging?
must he be fogging?
must we be fogging?
must you be fogging?
must they be fogging? 	must I have fogged?
must you have fogged?
must he have fogged?
must we have fogged?
must you have fogged?
must they have fogged? 	must I have been fogging?
must you have been fogging?
must he have been fogging?
must we have been fogging?
must you have been fogging?
must they have been fogging? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not fog?
must you not fog?
must he not fog?
must we not fog?
must you not fog?
must they not fog? 	must I not be fogging?
must you not be fogging?
must he not be fogging?
must we not be fogging?
must you not be fogging?
must they not be fogging? 	must I not have fogged?
must you not have fogged?
must he not have fogged?
must we not have fogged?
must you not have fogged?
must they not have fogged? 	must I not have been fogging?
must you not have been fogging?
must he not have been fogging?
must we not have been fogging?
must you not have been fogging?
must they not have been fogging?