could hyphenate
Regular verb: hyphenate - hyphenated- hyphenated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could hyphenate
you could hyphenate
he could hyphenate
we could hyphenate
you could hyphenate
they could hyphenate 	I could be hyphenating
you could be hyphenating
he could be hyphenating
we could be hyphenating
you could be hyphenating
they could be hyphenating	I could have hyphenated
you could have hyphenated
he could have hyphenated
we could have hyphenated
you could have hyphenated
they could have hyphenated	I could have been hyphenating
you could have been hyphenating
he could have been hyphenating
we could have been hyphenating
you could have been hyphenating
they could have been hyphenating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not hyphenate
you could not hyphenate
he could not hyphenate
we could not hyphenate
you could not hyphenate
they could not hyphenate 	I could not be hyphenating
you could not be hyphenating
he could not be hyphenating
we could not be hyphenating
you could not be hyphenating
they could not be hyphenating	I could not have hyphenated
you could not have hyphenated
he could not have hyphenated
we could not have hyphenated
you could not have hyphenated
they could not have hyphenated	I could not have been hyphenating
you could not have been hyphenating
he could not have been hyphenating
we could not have been hyphenating
you could not have been hyphenating
they could not have been hyphenating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I hyphenate?
could you hyphenate?
could he hyphenate?
could we hyphenate?
could you hyphenate?
could they hyphenate? 	could I be hyphenating?
could you be hyphenating?
could he be hyphenating?
could we be hyphenating?
could you be hyphenating?
could they be hyphenating? 	could I have hyphenated?
could you have hyphenated?
could he have hyphenated?
could we have hyphenated?
could you have hyphenated?
could they have hyphenated? 	could I have been hyphenating?
could you have been hyphenating?
could he have been hyphenating?
could we have been hyphenating?
could you have been hyphenating?
could they have been hyphenating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not hyphenate?
could you not hyphenate?
could he not hyphenate?
could we not hyphenate?
could you not hyphenate?
could they not hyphenate? 	could I not be hyphenating?
could you not be hyphenating?
could he not be hyphenating?
could we not be hyphenating?
could you not be hyphenating?
could they not be hyphenating? 	could I not have hyphenated?
could you not have hyphenated?
could he not have hyphenated?
could we not have hyphenated?
could you not have hyphenated?
could they not have hyphenated? 	could I not have been hyphenating?
could you not have been hyphenating?
could he not have been hyphenating?
could we not have been hyphenating?
could you not have been hyphenating?
could they not have been hyphenating?