must groan
Regular verb: groan - groaned- groaned

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must groan
you must groan
he must groan
we must groan
you must groan
they must groan 	I must be groaning
you must be groaning
he must be groaning
we must be groaning
you must be groaning
they must be groaning	I must have groaned
you must have groaned
he must have groaned
we must have groaned
you must have groaned
they must have groaned	I must have been groaning
you must have been groaning
he must have been groaning
we must have been groaning
you must have been groaning
they must have been groaning	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not groan
you must not groan
he must not groan
we must not groan
you must not groan
they must not groan 	I must not be groaning
you must not be groaning
he must not be groaning
we must not be groaning
you must not be groaning
they must not be groaning	I must not have groaned
you must not have groaned
he must not have groaned
we must not have groaned
you must not have groaned
they must not have groaned	I must not have been groaning
you must not have been groaning
he must not have been groaning
we must not have been groaning
you must not have been groaning
they must not have been groaning	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I groan?
must you groan?
must he groan?
must we groan?
must you groan?
must they groan? 	must I be groaning?
must you be groaning?
must he be groaning?
must we be groaning?
must you be groaning?
must they be groaning? 	must I have groaned?
must you have groaned?
must he have groaned?
must we have groaned?
must you have groaned?
must they have groaned? 	must I have been groaning?
must you have been groaning?
must he have been groaning?
must we have been groaning?
must you have been groaning?
must they have been groaning? 	

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