must lichen
Regular verb: lichen - lichened- lichened

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must lichen
you must lichen
he must lichen
we must lichen
you must lichen
they must lichen 	I must be lichening
you must be lichening
he must be lichening
we must be lichening
you must be lichening
they must be lichening	I must have lichened
you must have lichened
he must have lichened
we must have lichened
you must have lichened
they must have lichened	I must have been lichening
you must have been lichening
he must have been lichening
we must have been lichening
you must have been lichening
they must have been lichening	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not lichen
you must not lichen
he must not lichen
we must not lichen
you must not lichen
they must not lichen 	I must not be lichening
you must not be lichening
he must not be lichening
we must not be lichening
you must not be lichening
they must not be lichening	I must not have lichened
you must not have lichened
he must not have lichened
we must not have lichened
you must not have lichened
they must not have lichened	I must not have been lichening
you must not have been lichening
he must not have been lichening
we must not have been lichening
you must not have been lichening
they must not have been lichening	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I lichen?
must you lichen?
must he lichen?
must we lichen?
must you lichen?
must they lichen? 	must I be lichening?
must you be lichening?
must he be lichening?
must we be lichening?
must you be lichening?
must they be lichening? 	must I have lichened?
must you have lichened?
must he have lichened?
must we have lichened?
must you have lichened?
must they have lichened? 	must I have been lichening?
must you have been lichening?
must he have been lichening?
must we have been lichening?
must you have been lichening?
must they have been lichening? 	

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