English verb conjugation
COULD OSSIFY

Regular verb: ossify - ossified - ossified

Affirmation

Simple form	V-ing form
I could ossify you could ossify she could ossify we could ossify you could ossify they could ossify	I could be ossifying you could be ossifying she could be ossifying we could be ossifying you could be ossifying they could be ossifying
Perfect	V-ing perfect
I could have ossified you could have ossified she could have ossified we could have ossified you could have ossified they could have ossified	I could have been ossifying you could have been ossifying she could have been ossifying we could have been ossifying you could have been ossifying they could have been ossifying

Negation

Simple form	V-ing form
I couldn't ossify you couldn't ossify she couldn't ossify we couldn't ossify you couldn't ossify they couldn't ossify	I couldn't be ossifying you couldn't be ossifying she couldn't be ossifying we couldn't be ossifying you couldn't be ossifying they couldn't be ossifying
Perfect	V-ing perfect
I couldn't have ossified you couldn't have ossified she couldn't have ossified we couldn't have ossified you couldn't have ossified they couldn't have ossified	I couldn't have been ossifying you couldn't have been ossifying she couldn't have been ossifying we couldn't have been ossifying you couldn't have been ossifying they couldn't have been ossifying

Interrogative form

Simple form	V-ing form
could I ossify? could you ossify? could she ossify? could we ossify? could you ossify? could they ossify?	could I be ossifying? could you be ossifying? could she be ossifying? could we be ossifying? could you be ossifying? could they be ossifying?
Perfect	V-ing perfect
could I have ossified? could you have ossified? could she have ossified? could we have ossified? could you have ossified? could they have ossified?	could I have been ossifying? could you have been ossifying? could she have been ossifying? could we have been ossifying? could you have been ossifying? could they have been ossifying?

Interro-negative form

Simple form	V-ing form
couldn't I ossify? couldn't you ossify? couldn't she ossify? couldn't we ossify? couldn't you ossify? couldn't they ossify?	couldn't I be ossifying? couldn't you be ossifying? couldn't she be ossifying? couldn't we be ossifying? couldn't you be ossifying? couldn't they be ossifying?
Perfect	V-ing perfect
couldn't I have ossified? couldn't you have ossified? couldn't she have ossified? couldn't we have ossified? couldn't you have ossified? couldn't they have ossified?	couldn't I have been ossifying? couldn't you have been ossifying? couldn't she have been ossifying? couldn't we have been ossifying? couldn't you have been ossifying? couldn't they have been ossifying?