English verb conjugation
COULD FORTIFY

Regular verb: fortify - fortified - fortified

Affirmation

Simple form	V-ing form
I could fortify you could fortify she could fortify we could fortify you could fortify they could fortify	I could be fortifying you could be fortifying she could be fortifying we could be fortifying you could be fortifying they could be fortifying
Perfect	V-ing perfect
I could have fortified you could have fortified she could have fortified we could have fortified you could have fortified they could have fortified	I could have been fortifying you could have been fortifying she could have been fortifying we could have been fortifying you could have been fortifying they could have been fortifying

Negation

Simple form	V-ing form
I couldn't fortify you couldn't fortify she couldn't fortify we couldn't fortify you couldn't fortify they couldn't fortify	I couldn't be fortifying you couldn't be fortifying she couldn't be fortifying we couldn't be fortifying you couldn't be fortifying they couldn't be fortifying
Perfect	V-ing perfect
I couldn't have fortified you couldn't have fortified she couldn't have fortified we couldn't have fortified you couldn't have fortified they couldn't have fortified	I couldn't have been fortifying you couldn't have been fortifying she couldn't have been fortifying we couldn't have been fortifying you couldn't have been fortifying they couldn't have been fortifying

Interrogative form

Simple form	V-ing form
could I fortify? could you fortify? could she fortify? could we fortify? could you fortify? could they fortify?	could I be fortifying? could you be fortifying? could she be fortifying? could we be fortifying? could you be fortifying? could they be fortifying?
Perfect	V-ing perfect
could I have fortified? could you have fortified? could she have fortified? could we have fortified? could you have fortified? could they have fortified?	could I have been fortifying? could you have been fortifying? could she have been fortifying? could we have been fortifying? could you have been fortifying? could they have been fortifying?

Interro-negative form

Simple form	V-ing form
couldn't I fortify? couldn't you fortify? couldn't she fortify? couldn't we fortify? couldn't you fortify? couldn't they fortify?	couldn't I be fortifying? couldn't you be fortifying? couldn't she be fortifying? couldn't we be fortifying? couldn't you be fortifying? couldn't they be fortifying?
Perfect	V-ing perfect
couldn't I have fortified? couldn't you have fortified? couldn't she have fortified? couldn't we have fortified? couldn't you have fortified? couldn't they have fortified?	couldn't I have been fortifying? couldn't you have been fortifying? couldn't she have been fortifying? couldn't we have been fortifying? couldn't you have been fortifying? couldn't they have been fortifying?