English verb conjugation
COULD FORTIFY

Regular verb: fortify - fortified - fortified

Affirmation

Simple form	V-ing form
I could fortify you could fortify he could fortify we could fortify you could fortify they could fortify	I could be fortifying you could be fortifying he 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 he 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 he 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 could not fortify you could not fortify he could not fortify we could not fortify you could not fortify they could not fortify	I could not be fortifying you could not be fortifying he could not be fortifying we could not be fortifying you could not be fortifying they could not be fortifying
Perfect	V-ing perfect
I could not have fortified you could not have fortified he could not have fortified we could not have fortified you could not have fortified they could not have fortified	I could not have been fortifying you could not have been fortifying he could not have been fortifying we could not have been fortifying you could not have been fortifying they could not have been fortifying

Interrogative form

Simple form	V-ing form
could I fortify? could you fortify? could he fortify? could we fortify? could you fortify? could they fortify?	could I be fortifying? could you be fortifying? could he 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 he 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 he 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
could I not fortify? could you not fortify? could he not fortify? could we not fortify? could you not fortify? could they not fortify?	could I not be fortifying? could you not be fortifying? could he not be fortifying? could we not be fortifying? could you not be fortifying? could they not be fortifying?
Perfect	V-ing perfect
could I not have fortified? could you not have fortified? could he not have fortified? could we not have fortified? could you not have fortified? could they not have fortified?	could I not have been fortifying? could you not have been fortifying? could he not have been fortifying? could we not have been fortifying? could you not have been fortifying? could they not have been fortifying?