must crow
Regular verb: crow - crowed- crowed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must crow
you must crow
he must crow
we must crow
you must crow
they must crow 	I must be crowing
you must be crowing
he must be crowing
we must be crowing
you must be crowing
they must be crowing	I must have crowed
you must have crowed
he must have crowed
we must have crowed
you must have crowed
they must have crowed	I must have been crowing
you must have been crowing
he must have been crowing
we must have been crowing
you must have been crowing
they must have been crowing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not crow
you must not crow
he must not crow
we must not crow
you must not crow
they must not crow 	I must not be crowing
you must not be crowing
he must not be crowing
we must not be crowing
you must not be crowing
they must not be crowing	I must not have crowed
you must not have crowed
he must not have crowed
we must not have crowed
you must not have crowed
they must not have crowed	I must not have been crowing
you must not have been crowing
he must not have been crowing
we must not have been crowing
you must not have been crowing
they must not have been crowing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I crow?
must you crow?
must he crow?
must we crow?
must you crow?
must they crow? 	must I be crowing?
must you be crowing?
must he be crowing?
must we be crowing?
must you be crowing?
must they be crowing? 	must I have crowed?
must you have crowed?
must he have crowed?
must we have crowed?
must you have crowed?
must they have crowed? 	must I have been crowing?
must you have been crowing?
must he have been crowing?
must we have been crowing?
must you have been crowing?
must they have been crowing? 	

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