must coffin
Regular verb: coffin - coffined- coffined

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must coffin
you must coffin
she must coffin
we must coffin
you must coffin
they must coffin 	I must be coffining
you must be coffining
she must be coffining
we must be coffining
you must be coffining
they must be coffining	I must have coffined
you must have coffined
she must have coffined
we must have coffined
you must have coffined
they must have coffined	I must have been coffining
you must have been coffining
she must have been coffining
we must have been coffining
you must have been coffining
they must have been coffining	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not coffin
you must not coffin
she must not coffin
we must not coffin
you must not coffin
they must not coffin 	I must not be coffining
you must not be coffining
she must not be coffining
we must not be coffining
you must not be coffining
they must not be coffining	I must not have coffined
you must not have coffined
she must not have coffined
we must not have coffined
you must not have coffined
they must not have coffined	I must not have been coffining
you must not have been coffining
she must not have been coffining
we must not have been coffining
you must not have been coffining
they must not have been coffining	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I coffin?
must you coffin?
must she coffin?
must we coffin?
must you coffin?
must they coffin? 	must I be coffining?
must you be coffining?
must she be coffining?
must we be coffining?
must you be coffining?
must they be coffining? 	must I have coffined?
must you have coffined?
must she have coffined?
must we have coffined?
must you have coffined?
must they have coffined? 	must I have been coffining?
must you have been coffining?
must she have been coffining?
must we have been coffining?
must you have been coffining?
must they have been coffining? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not coffin?
must you not coffin?
must she not coffin?
must we not coffin?
must you not coffin?
must they not coffin? 	must I not be coffining?
must you not be coffining?
must she not be coffining?
must we not be coffining?
must you not be coffining?
must they not be coffining? 	must I not have coffined?
must you not have coffined?
must she not have coffined?
must we not have coffined?
must you not have coffined?
must they not have coffined? 	must I not have been coffining?
must you not have been coffining?
must she not have been coffining?
must we not have been coffining?
must you not have been coffining?
must they not have been coffining?