must steam
Regular verb: steam - steamed- steamed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must steam
you must steam
she must steam
we must steam
you must steam
they must steam 	I must be steaming
you must be steaming
she must be steaming
we must be steaming
you must be steaming
they must be steaming	I must have steamed
you must have steamed
she must have steamed
we must have steamed
you must have steamed
they must have steamed	I must have been steaming
you must have been steaming
she must have been steaming
we must have been steaming
you must have been steaming
they must have been steaming	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not steam
you must not steam
she must not steam
we must not steam
you must not steam
they must not steam 	I must not be steaming
you must not be steaming
she must not be steaming
we must not be steaming
you must not be steaming
they must not be steaming	I must not have steamed
you must not have steamed
she must not have steamed
we must not have steamed
you must not have steamed
they must not have steamed	I must not have been steaming
you must not have been steaming
she must not have been steaming
we must not have been steaming
you must not have been steaming
they must not have been steaming	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I steam?
must you steam?
must she steam?
must we steam?
must you steam?
must they steam? 	must I be steaming?
must you be steaming?
must she be steaming?
must we be steaming?
must you be steaming?
must they be steaming? 	must I have steamed?
must you have steamed?
must she have steamed?
must we have steamed?
must you have steamed?
must they have steamed? 	must I have been steaming?
must you have been steaming?
must she have been steaming?
must we have been steaming?
must you have been steaming?
must they have been steaming? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not steam?
must you not steam?
must she not steam?
must we not steam?
must you not steam?
must they not steam? 	must I not be steaming?
must you not be steaming?
must she not be steaming?
must we not be steaming?
must you not be steaming?
must they not be steaming? 	must I not have steamed?
must you not have steamed?
must she not have steamed?
must we not have steamed?
must you not have steamed?
must they not have steamed? 	must I not have been steaming?
must you not have been steaming?
must she not have been steaming?
must we not have been steaming?
must you not have been steaming?
must they not have been steaming?