could fortify
Regular verb: fortify - fortified- fortified

Affirmation 	
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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	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 	
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I could not fortify
you could not fortify
she 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
she could not be fortifying
we could not be fortifying
you could not be fortifying
they could not be fortifying	I could not have fortified
you could not have fortified
she 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
she 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 	
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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? 	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 	
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could I not fortify?
could you not fortify?
could she 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 she not be fortifying?
could we not be fortifying?
could you not be fortifying?
could they not be fortifying? 	could I not have fortified?
could you not have fortified?
could she 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 she not have been fortifying?
could we not have been fortifying?
could you not have been fortifying?
could they not have been fortifying?