could syllabify
Regular verb: syllabify - syllabified- syllabified

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could syllabify
you could syllabify
he could syllabify
we could syllabify
you could syllabify
they could syllabify 	I could be syllabifying
you could be syllabifying
he could be syllabifying
we could be syllabifying
you could be syllabifying
they could be syllabifying	I could have syllabified
you could have syllabified
he could have syllabified
we could have syllabified
you could have syllabified
they could have syllabified	I could have been syllabifying
you could have been syllabifying
he could have been syllabifying
we could have been syllabifying
you could have been syllabifying
they could have been syllabifying	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not syllabify
you could not syllabify
he could not syllabify
we could not syllabify
you could not syllabify
they could not syllabify 	I could not be syllabifying
you could not be syllabifying
he could not be syllabifying
we could not be syllabifying
you could not be syllabifying
they could not be syllabifying	I could not have syllabified
you could not have syllabified
he could not have syllabified
we could not have syllabified
you could not have syllabified
they could not have syllabified	I could not have been syllabifying
you could not have been syllabifying
he could not have been syllabifying
we could not have been syllabifying
you could not have been syllabifying
they could not have been syllabifying	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I syllabify?
could you syllabify?
could he syllabify?
could we syllabify?
could you syllabify?
could they syllabify? 	could I be syllabifying?
could you be syllabifying?
could he be syllabifying?
could we be syllabifying?
could you be syllabifying?
could they be syllabifying? 	could I have syllabified?
could you have syllabified?
could he have syllabified?
could we have syllabified?
could you have syllabified?
could they have syllabified? 	could I have been syllabifying?
could you have been syllabifying?
could he have been syllabifying?
could we have been syllabifying?
could you have been syllabifying?
could they have been syllabifying? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not syllabify?
could you not syllabify?
could he not syllabify?
could we not syllabify?
could you not syllabify?
could they not syllabify? 	could I not be syllabifying?
could you not be syllabifying?
could he not be syllabifying?
could we not be syllabifying?
could you not be syllabifying?
could they not be syllabifying? 	could I not have syllabified?
could you not have syllabified?
could he not have syllabified?
could we not have syllabified?
could you not have syllabified?
could they not have syllabified? 	could I not have been syllabifying?
could you not have been syllabifying?
could he not have been syllabifying?
could we not have been syllabifying?
could you not have been syllabifying?
could they not have been syllabifying?