English verb conjugation
COULD PREFORMULATE

Regular verb: preformulate - preformulated - preformulated

Affirmation

Simple form	V-ing form
I could preformulate you could preformulate she could preformulate we could preformulate you could preformulate they could preformulate	I could be preformulating you could be preformulating she could be preformulating we could be preformulating you could be preformulating they could be preformulating
Perfect	V-ing perfect
I could have preformulated you could have preformulated she could have preformulated we could have preformulated you could have preformulated they could have preformulated	I could have been preformulating you could have been preformulating she could have been preformulating we could have been preformulating you could have been preformulating they could have been preformulating

Negation

Simple form	V-ing form
I couldn't preformulate you couldn't preformulate she couldn't preformulate we couldn't preformulate you couldn't preformulate they couldn't preformulate	I couldn't be preformulating you couldn't be preformulating she couldn't be preformulating we couldn't be preformulating you couldn't be preformulating they couldn't be preformulating
Perfect	V-ing perfect
I couldn't have preformulated you couldn't have preformulated she couldn't have preformulated we couldn't have preformulated you couldn't have preformulated they couldn't have preformulated	I couldn't have been preformulating you couldn't have been preformulating she couldn't have been preformulating we couldn't have been preformulating you couldn't have been preformulating they couldn't have been preformulating

Interrogative form

Simple form	V-ing form
could I preformulate? could you preformulate? could she preformulate? could we preformulate? could you preformulate? could they preformulate?	could I be preformulating? could you be preformulating? could she be preformulating? could we be preformulating? could you be preformulating? could they be preformulating?
Perfect	V-ing perfect
could I have preformulated? could you have preformulated? could she have preformulated? could we have preformulated? could you have preformulated? could they have preformulated?	could I have been preformulating? could you have been preformulating? could she have been preformulating? could we have been preformulating? could you have been preformulating? could they have been preformulating?

Interro-negative form

Simple form	V-ing form
couldn't I preformulate? couldn't you preformulate? couldn't she preformulate? couldn't we preformulate? couldn't you preformulate? couldn't they preformulate?	couldn't I be preformulating? couldn't you be preformulating? couldn't she be preformulating? couldn't we be preformulating? couldn't you be preformulating? couldn't they be preformulating?
Perfect	V-ing perfect
couldn't I have preformulated? couldn't you have preformulated? couldn't she have preformulated? couldn't we have preformulated? couldn't you have preformulated? couldn't they have preformulated?	couldn't I have been preformulating? couldn't you have been preformulating? couldn't she have been preformulating? couldn't we have been preformulating? couldn't you have been preformulating? couldn't they have been preformulating?