English verb conjugation
COULD PETRIFY

Regular verb: petrify - petrified - petrified

Affirmation

Simple form	V-ing form
I could petrify you could petrify she could petrify we could petrify you could petrify they could petrify	I could be petrifying you could be petrifying she could be petrifying we could be petrifying you could be petrifying they could be petrifying
Perfect	V-ing perfect
I could have petrified you could have petrified she could have petrified we could have petrified you could have petrified they could have petrified	I could have been petrifying you could have been petrifying she could have been petrifying we could have been petrifying you could have been petrifying they could have been petrifying

Negation

Simple form	V-ing form
I couldn't petrify you couldn't petrify she couldn't petrify we couldn't petrify you couldn't petrify they couldn't petrify	I couldn't be petrifying you couldn't be petrifying she couldn't be petrifying we couldn't be petrifying you couldn't be petrifying they couldn't be petrifying
Perfect	V-ing perfect
I couldn't have petrified you couldn't have petrified she couldn't have petrified we couldn't have petrified you couldn't have petrified they couldn't have petrified	I couldn't have been petrifying you couldn't have been petrifying she couldn't have been petrifying we couldn't have been petrifying you couldn't have been petrifying they couldn't have been petrifying

Interrogative form

Simple form	V-ing form
could I petrify? could you petrify? could she petrify? could we petrify? could you petrify? could they petrify?	could I be petrifying? could you be petrifying? could she be petrifying? could we be petrifying? could you be petrifying? could they be petrifying?
Perfect	V-ing perfect
could I have petrified? could you have petrified? could she have petrified? could we have petrified? could you have petrified? could they have petrified?	could I have been petrifying? could you have been petrifying? could she have been petrifying? could we have been petrifying? could you have been petrifying? could they have been petrifying?

Interro-negative form

Simple form	V-ing form
couldn't I petrify? couldn't you petrify? couldn't she petrify? couldn't we petrify? couldn't you petrify? couldn't they petrify?	couldn't I be petrifying? couldn't you be petrifying? couldn't she be petrifying? couldn't we be petrifying? couldn't you be petrifying? couldn't they be petrifying?
Perfect	V-ing perfect
couldn't I have petrified? couldn't you have petrified? couldn't she have petrified? couldn't we have petrified? couldn't you have petrified? couldn't they have petrified?	couldn't I have been petrifying? couldn't you have been petrifying? couldn't she have been petrifying? couldn't we have been petrifying? couldn't you have been petrifying? couldn't they have been petrifying?