can fortify
Regular verb: fortify - fortified- fortified

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

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I cannot fortify
you cannot fortify
she cannot fortify
we cannot fortify
you cannot fortify
they cannot fortify 	I cannot be fortifying
you cannot be fortifying
she cannot be fortifying
we cannot be fortifying
you cannot be fortifying
they cannot be fortifying	I cannot have fortified
you cannot have fortified
she cannot have fortified
we cannot have fortified
you cannot have fortified
they cannot have fortified	I cannot have been fortifying
you cannot have been fortifying
she cannot have been fortifying
we cannot have been fortifying
you cannot have been fortifying
they cannot have been fortifying	

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

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I not fortify?
can you not fortify?
can she not fortify?
can we not fortify?
can you not fortify?
can they not fortify? 	can I not be fortifying?
can you not be fortifying?
can she not be fortifying?
can we not be fortifying?
can you not be fortifying?
can they not be fortifying? 	can I not have fortified?
can you not have fortified?
can she not have fortified?
can we not have fortified?
can you not have fortified?
can they not have fortified? 	can I not have been fortifying?
can you not have been fortifying?
can she not have been fortifying?
can we not have been fortifying?
can you not have been fortifying?
can they not have been fortifying?