English verb conjugation
COULD INSULATE

Regular verb: insulate - insulated - insulated

Affirmation

Simple form	V-ing form
I could insulate you could insulate she could insulate we could insulate you could insulate they could insulate	I could be insulating you could be insulating she could be insulating we could be insulating you could be insulating they could be insulating
Perfect	V-ing perfect
I could have insulated you could have insulated she could have insulated we could have insulated you could have insulated they could have insulated	I could have been insulating you could have been insulating she could have been insulating we could have been insulating you could have been insulating they could have been insulating

Negation

Simple form	V-ing form
I couldn't insulate you couldn't insulate she couldn't insulate we couldn't insulate you couldn't insulate they couldn't insulate	I couldn't be insulating you couldn't be insulating she couldn't be insulating we couldn't be insulating you couldn't be insulating they couldn't be insulating
Perfect	V-ing perfect
I couldn't have insulated you couldn't have insulated she couldn't have insulated we couldn't have insulated you couldn't have insulated they couldn't have insulated	I couldn't have been insulating you couldn't have been insulating she couldn't have been insulating we couldn't have been insulating you couldn't have been insulating they couldn't have been insulating

Interrogative form

Simple form	V-ing form
could I insulate? could you insulate? could she insulate? could we insulate? could you insulate? could they insulate?	could I be insulating? could you be insulating? could she be insulating? could we be insulating? could you be insulating? could they be insulating?
Perfect	V-ing perfect
could I have insulated? could you have insulated? could she have insulated? could we have insulated? could you have insulated? could they have insulated?	could I have been insulating? could you have been insulating? could she have been insulating? could we have been insulating? could you have been insulating? could they have been insulating?

Interro-negative form

Simple form	V-ing form
couldn't I insulate? couldn't you insulate? couldn't she insulate? couldn't we insulate? couldn't you insulate? couldn't they insulate?	couldn't I be insulating? couldn't you be insulating? couldn't she be insulating? couldn't we be insulating? couldn't you be insulating? couldn't they be insulating?
Perfect	V-ing perfect
couldn't I have insulated? couldn't you have insulated? couldn't she have insulated? couldn't we have insulated? couldn't you have insulated? couldn't they have insulated?	couldn't I have been insulating? couldn't you have been insulating? couldn't she have been insulating? couldn't we have been insulating? couldn't you have been insulating? couldn't they have been insulating?