must counterbid
Irregular verb: counterbid - counterbid- counterbid

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must counterbid
you must counterbid
he must counterbid
we must counterbid
you must counterbid
they must counterbid 	I must be counterbiding
you must be counterbiding
he must be counterbiding
we must be counterbiding
you must be counterbiding
they must be counterbiding	I must have counterbid
you must have counterbid
he must have counterbid
we must have counterbid
you must have counterbid
they must have counterbid	I must have been counterbiding
you must have been counterbiding
he must have been counterbiding
we must have been counterbiding
you must have been counterbiding
they must have been counterbiding	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not counterbid
you must not counterbid
he must not counterbid
we must not counterbid
you must not counterbid
they must not counterbid 	I must not be counterbiding
you must not be counterbiding
he must not be counterbiding
we must not be counterbiding
you must not be counterbiding
they must not be counterbiding	I must not have counterbid
you must not have counterbid
he must not have counterbid
we must not have counterbid
you must not have counterbid
they must not have counterbid	I must not have been counterbiding
you must not have been counterbiding
he must not have been counterbiding
we must not have been counterbiding
you must not have been counterbiding
they must not have been counterbiding	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I counterbid?
must you counterbid?
must he counterbid?
must we counterbid?
must you counterbid?
must they counterbid? 	must I be counterbiding?
must you be counterbiding?
must he be counterbiding?
must we be counterbiding?
must you be counterbiding?
must they be counterbiding? 	must I have counterbid?
must you have counterbid?
must he have counterbid?
must we have counterbid?
must you have counterbid?
must they have counterbid? 	must I have been counterbiding?
must you have been counterbiding?
must he have been counterbiding?
must we have been counterbiding?
must you have been counterbiding?
must they have been counterbiding? 	

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