English verb conjugation
COULD RETROFIT

Irregular verb: retrofit - retrofit - retrofit

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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
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
Perfect	V-ing perfect
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
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?
Perfect	V-ing perfect
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
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?
Perfect	V-ing perfect
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?