must frog
Regular verb: frog - froged- froged

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must frog
you must frog
he must frog
we must frog
you must frog
they must frog 	I must be froging
you must be froging
he must be froging
we must be froging
you must be froging
they must be froging	I must have froged
you must have froged
he must have froged
we must have froged
you must have froged
they must have froged	I must have been froging
you must have been froging
he must have been froging
we must have been froging
you must have been froging
they must have been froging	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not frog
you must not frog
he must not frog
we must not frog
you must not frog
they must not frog 	I must not be froging
you must not be froging
he must not be froging
we must not be froging
you must not be froging
they must not be froging	I must not have froged
you must not have froged
he must not have froged
we must not have froged
you must not have froged
they must not have froged	I must not have been froging
you must not have been froging
he must not have been froging
we must not have been froging
you must not have been froging
they must not have been froging	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I frog?
must you frog?
must he frog?
must we frog?
must you frog?
must they frog? 	must I be froging?
must you be froging?
must he be froging?
must we be froging?
must you be froging?
must they be froging? 	must I have froged?
must you have froged?
must he have froged?
must we have froged?
must you have froged?
must they have froged? 	must I have been froging?
must you have been froging?
must he have been froging?
must we have been froging?
must you have been froging?
must they have been froging? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not frog?
must you not frog?
must he not frog?
must we not frog?
must you not frog?
must they not frog? 	must I not be froging?
must you not be froging?
must he not be froging?
must we not be froging?
must you not be froging?
must they not be froging? 	must I not have froged?
must you not have froged?
must he not have froged?
must we not have froged?
must you not have froged?
must they not have froged? 	must I not have been froging?
must you not have been froging?
must he not have been froging?
must we not have been froging?
must you not have been froging?
must they not have been froging?