could retrofit
Irregular verb: retrofit - retrofit- retrofit

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could retrofit
you could retrofit
he could retrofit
we could retrofit
you could retrofit
they could retrofit 	I could be retrofiting
you could be retrofiting
he could be retrofiting
we could be retrofiting
you could be retrofiting
they could be retrofiting	I could have retrofit
you could have retrofit
he could have retrofit
we could have retrofit
you could have retrofit
they could have retrofit	I could have been retrofiting
you could have been retrofiting
he could have been retrofiting
we could have been retrofiting
you could have been retrofiting
they could have been retrofiting	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't retrofit
you couldn't retrofit
he couldn't retrofit
we couldn't retrofit
you couldn't retrofit
they couldn't retrofit 	I couldn't be retrofiting
you couldn't be retrofiting
he couldn't be retrofiting
we couldn't be retrofiting
you couldn't be retrofiting
they couldn't be retrofiting	I couldn't have retrofit
you couldn't have retrofit
he couldn't have retrofit
we couldn't have retrofit
you couldn't have retrofit
they couldn't have retrofit	I couldn't have been retrofiting
you couldn't have been retrofiting
he couldn't have been retrofiting
we couldn't have been retrofiting
you couldn't have been retrofiting
they couldn't have been retrofiting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I retrofit?
could you retrofit?
could he retrofit?
could we retrofit?
could you retrofit?
could they retrofit? 	could I be retrofiting?
could you be retrofiting?
could he be retrofiting?
could we be retrofiting?
could you be retrofiting?
could they be retrofiting? 	could I have retrofit?
could you have retrofit?
could he have retrofit?
could we have retrofit?
could you have retrofit?
could they have retrofit? 	could I have been retrofiting?
could you have been retrofiting?
could he have been retrofiting?
could we have been retrofiting?
could you have been retrofiting?
could they have been retrofiting? 	

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