could preformulate
Regular verb: preformulate - preformulated- preformulated

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