should lichen
Regular verb: lichen - lichened- lichened

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I'd lichen
you'd lichen
he'd lichen
we'd lichen
you'd lichen
they'd lichen 	I'd be lichening
you'd be lichening
he'd be lichening
we'd be lichening
you'd be lichening
they'd be lichening	I should've lichened
you should've lichened
he should've lichened
we should've lichened
you should've lichened
they should've lichened	I should've been lichening
you should've been lichening
he should've been lichening
we should've been lichening
you should've been lichening
they should've been lichening	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I shouldn't lichen
you shouldn't lichen
he shouldn't lichen
we shouldn't lichen
you shouldn't lichen
they shouldn't lichen 	I shouldn't be lichening
you shouldn't be lichening
he shouldn't be lichening
we shouldn't be lichening
you shouldn't be lichening
they shouldn't be lichening	I shouldn't have lichened
you shouldn't have lichened
he shouldn't have lichened
we shouldn't have lichened
you shouldn't have lichened
they shouldn't have lichened	I shouldn't have been lichening
you shouldn't have been lichening
he shouldn't have been lichening
we shouldn't have been lichening
you shouldn't have been lichening
they shouldn't have been lichening	

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

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