could retrofire
Regular verb: retrofire - retrofired- retrofired

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could retrofire
you could retrofire
he could retrofire
we could retrofire
you could retrofire
they could retrofire 	I could be retrofiring
you could be retrofiring
he could be retrofiring
we could be retrofiring
you could be retrofiring
they could be retrofiring	I could have retrofired
you could have retrofired
he could have retrofired
we could have retrofired
you could have retrofired
they could have retrofired	I could have been retrofiring
you could have been retrofiring
he could have been retrofiring
we could have been retrofiring
you could have been retrofiring
they could have been retrofiring	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't retrofire
you couldn't retrofire
he couldn't retrofire
we couldn't retrofire
you couldn't retrofire
they couldn't retrofire 	I couldn't be retrofiring
you couldn't be retrofiring
he couldn't be retrofiring
we couldn't be retrofiring
you couldn't be retrofiring
they couldn't be retrofiring	I couldn't have retrofired
you couldn't have retrofired
he couldn't have retrofired
we couldn't have retrofired
you couldn't have retrofired
they couldn't have retrofired	I couldn't have been retrofiring
you couldn't have been retrofiring
he couldn't have been retrofiring
we couldn't have been retrofiring
you couldn't have been retrofiring
they couldn't have been retrofiring	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I retrofire?
could you retrofire?
could he retrofire?
could we retrofire?
could you retrofire?
could they retrofire? 	could I be retrofiring?
could you be retrofiring?
could he be retrofiring?
could we be retrofiring?
could you be retrofiring?
could they be retrofiring? 	could I have retrofired?
could you have retrofired?
could he have retrofired?
could we have retrofired?
could you have retrofired?
could they have retrofired? 	could I have been retrofiring?
could you have been retrofiring?
could he have been retrofiring?
could we have been retrofiring?
could you have been retrofiring?
could they have been retrofiring? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I retrofire?
couldn't you retrofire?
couldn't he retrofire?
couldn't we retrofire?
couldn't you retrofire?
couldn't they retrofire? 	couldn't I be retrofiring?
couldn't you be retrofiring?
couldn't he be retrofiring?
couldn't we be retrofiring?
couldn't you be retrofiring?
couldn't they be retrofiring? 	couldn't I have retrofired?
couldn't you have retrofired?
couldn't he have retrofired?
couldn't we have retrofired?
couldn't you have retrofired?
couldn't they have retrofired? 	couldn't I have been retrofiring?
couldn't you have been retrofiring?
couldn't he have been retrofiring?
couldn't we have been retrofiring?
couldn't you have been retrofiring?
couldn't they have been retrofiring?