English verb conjugation
COULD PRETTIFY

Regular verb: prettify - prettified - prettified

Affirmation

Simple form	V-ing form
I could prettify you could prettify he could prettify we could prettify you could prettify they could prettify	I could be prettifying you could be prettifying he could be prettifying we could be prettifying you could be prettifying they could be prettifying
Perfect	V-ing perfect
I could have prettified you could have prettified he could have prettified we could have prettified you could have prettified they could have prettified	I could have been prettifying you could have been prettifying he could have been prettifying we could have been prettifying you could have been prettifying they could have been prettifying

Negation

Simple form	V-ing form
I couldn't prettify you couldn't prettify he couldn't prettify we couldn't prettify you couldn't prettify they couldn't prettify	I couldn't be prettifying you couldn't be prettifying he couldn't be prettifying we couldn't be prettifying you couldn't be prettifying they couldn't be prettifying
Perfect	V-ing perfect
I couldn't have prettified you couldn't have prettified he couldn't have prettified we couldn't have prettified you couldn't have prettified they couldn't have prettified	I couldn't have been prettifying you couldn't have been prettifying he couldn't have been prettifying we couldn't have been prettifying you couldn't have been prettifying they couldn't have been prettifying

Interrogative form

Simple form	V-ing form
could I prettify? could you prettify? could he prettify? could we prettify? could you prettify? could they prettify?	could I be prettifying? could you be prettifying? could he be prettifying? could we be prettifying? could you be prettifying? could they be prettifying?
Perfect	V-ing perfect
could I have prettified? could you have prettified? could he have prettified? could we have prettified? could you have prettified? could they have prettified?	could I have been prettifying? could you have been prettifying? could he have been prettifying? could we have been prettifying? could you have been prettifying? could they have been prettifying?

Interro-negative form

Simple form	V-ing form
couldn't I prettify? couldn't you prettify? couldn't he prettify? couldn't we prettify? couldn't you prettify? couldn't they prettify?	couldn't I be prettifying? couldn't you be prettifying? couldn't he be prettifying? couldn't we be prettifying? couldn't you be prettifying? couldn't they be prettifying?
Perfect	V-ing perfect
couldn't I have prettified? couldn't you have prettified? couldn't he have prettified? couldn't we have prettified? couldn't you have prettified? couldn't they have prettified?	couldn't I have been prettifying? couldn't you have been prettifying? couldn't he have been prettifying? couldn't we have been prettifying? couldn't you have been prettifying? couldn't they have been prettifying?