could lignify
Regular verb: lignify - lignified- lignified

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could lignify
you could lignify
she could lignify
we could lignify
you could lignify
they could lignify 	I could be lignifying
you could be lignifying
she could be lignifying
we could be lignifying
you could be lignifying
they could be lignifying	I could have lignified
you could have lignified
she could have lignified
we could have lignified
you could have lignified
they could have lignified	I could have been lignifying
you could have been lignifying
she could have been lignifying
we could have been lignifying
you could have been lignifying
they could have been lignifying	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't lignify
you couldn't lignify
she couldn't lignify
we couldn't lignify
you couldn't lignify
they couldn't lignify 	I couldn't be lignifying
you couldn't be lignifying
she couldn't be lignifying
we couldn't be lignifying
you couldn't be lignifying
they couldn't be lignifying	I couldn't have lignified
you couldn't have lignified
she couldn't have lignified
we couldn't have lignified
you couldn't have lignified
they couldn't have lignified	I couldn't have been lignifying
you couldn't have been lignifying
she couldn't have been lignifying
we couldn't have been lignifying
you couldn't have been lignifying
they couldn't have been lignifying	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I lignify?
could you lignify?
could she lignify?
could we lignify?
could you lignify?
could they lignify? 	could I be lignifying?
could you be lignifying?
could she be lignifying?
could we be lignifying?
could you be lignifying?
could they be lignifying? 	could I have lignified?
could you have lignified?
could she have lignified?
could we have lignified?
could you have lignified?
could they have lignified? 	could I have been lignifying?
could you have been lignifying?
could she have been lignifying?
could we have been lignifying?
could you have been lignifying?
could they have been lignifying? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I lignify?
couldn't you lignify?
couldn't she lignify?
couldn't we lignify?
couldn't you lignify?
couldn't they lignify? 	couldn't I be lignifying?
couldn't you be lignifying?
couldn't she be lignifying?
couldn't we be lignifying?
couldn't you be lignifying?
couldn't they be lignifying? 	couldn't I have lignified?
couldn't you have lignified?
couldn't she have lignified?
couldn't we have lignified?
couldn't you have lignified?
couldn't they have lignified? 	couldn't I have been lignifying?
couldn't you have been lignifying?
couldn't she have been lignifying?
couldn't we have been lignifying?
couldn't you have been lignifying?
couldn't they have been lignifying?