I could formularize you could formularize she could formularize we could formularize you could formularize they could formularize
V-ing form
I could be formularizing you could be formularizing she could be formularizing we could be formularizing you could be formularizing they could be formularizing
Perfect
I could have formularized you could have formularized she could have formularized we could have formularized you could have formularized they could have formularized
V-ing perfect
I could have been formularizing you could have been formularizing she could have been formularizing we could have been formularizing you could have been formularizing they could have been formularizing
Negation
Simple form
I couldn't formularize you couldn't formularize she couldn't formularize we couldn't formularize you couldn't formularize they couldn't formularize
V-ing form
I couldn't be formularizing you couldn't be formularizing she couldn't be formularizing we couldn't be formularizing you couldn't be formularizing they couldn't be formularizing
Perfect
I couldn't have formularized you couldn't have formularized she couldn't have formularized we couldn't have formularized you couldn't have formularized they couldn't have formularized
V-ing perfect
I couldn't have been formularizing you couldn't have been formularizing she couldn't have been formularizing we couldn't have been formularizing you couldn't have been formularizing they couldn't have been formularizing
Interrogative form
Simple form
could I formularize? could you formularize? could she formularize? could we formularize? could you formularize? could they formularize?
V-ing form
could I be formularizing? could you be formularizing? could she be formularizing? could we be formularizing? could you be formularizing? could they be formularizing?
Perfect
could I have formularized? could you have formularized? could she have formularized? could we have formularized? could you have formularized? could they have formularized?
V-ing perfect
could I have been formularizing? could you have been formularizing? could she have been formularizing? could we have been formularizing? could you have been formularizing? could they have been formularizing?
Interro-negative form
Simple form
couldn't I formularize? couldn't you formularize? couldn't she formularize? couldn't we formularize? couldn't you formularize? couldn't they formularize?
V-ing form
couldn't I be formularizing? couldn't you be formularizing? couldn't she be formularizing? couldn't we be formularizing? couldn't you be formularizing? couldn't they be formularizing?
Perfect
couldn't I have formularized? couldn't you have formularized? couldn't she have formularized? couldn't we have formularized? couldn't you have formularized? couldn't they have formularized?
V-ing perfect
couldn't I have been formularizing? couldn't you have been formularizing? couldn't she have been formularizing? couldn't we have been formularizing? couldn't you have been formularizing? couldn't they have been formularizing?