English verb conjugation
COULD LIGNIFY

Regular verb: lignify - lignified - lignified

Affirmation

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