I could harmonize you could harmonize he could harmonize we could harmonize you could harmonize they could harmonize
V-ing form
I could be harmonizing you could be harmonizing he could be harmonizing we could be harmonizing you could be harmonizing they could be harmonizing
Perfect
I could have harmonized you could have harmonized he could have harmonized we could have harmonized you could have harmonized they could have harmonized
V-ing perfect
I could have been harmonizing you could have been harmonizing he could have been harmonizing we could have been harmonizing you could have been harmonizing they could have been harmonizing
Negation
Simple form
I couldn't harmonize you couldn't harmonize he couldn't harmonize we couldn't harmonize you couldn't harmonize they couldn't harmonize
V-ing form
I couldn't be harmonizing you couldn't be harmonizing he couldn't be harmonizing we couldn't be harmonizing you couldn't be harmonizing they couldn't be harmonizing
Perfect
I couldn't have harmonized you couldn't have harmonized he couldn't have harmonized we couldn't have harmonized you couldn't have harmonized they couldn't have harmonized
V-ing perfect
I couldn't have been harmonizing you couldn't have been harmonizing he couldn't have been harmonizing we couldn't have been harmonizing you couldn't have been harmonizing they couldn't have been harmonizing
Interrogative form
Simple form
could I harmonize? could you harmonize? could he harmonize? could we harmonize? could you harmonize? could they harmonize?
V-ing form
could I be harmonizing? could you be harmonizing? could he be harmonizing? could we be harmonizing? could you be harmonizing? could they be harmonizing?
Perfect
could I have harmonized? could you have harmonized? could he have harmonized? could we have harmonized? could you have harmonized? could they have harmonized?
V-ing perfect
could I have been harmonizing? could you have been harmonizing? could he have been harmonizing? could we have been harmonizing? could you have been harmonizing? could they have been harmonizing?
Interro-negative form
Simple form
couldn't I harmonize? couldn't you harmonize? couldn't he harmonize? couldn't we harmonize? couldn't you harmonize? couldn't they harmonize?
V-ing form
couldn't I be harmonizing? couldn't you be harmonizing? couldn't he be harmonizing? couldn't we be harmonizing? couldn't you be harmonizing? couldn't they be harmonizing?
Perfect
couldn't I have harmonized? couldn't you have harmonized? couldn't he have harmonized? couldn't we have harmonized? couldn't you have harmonized? couldn't they have harmonized?
V-ing perfect
couldn't I have been harmonizing? couldn't you have been harmonizing? couldn't he have been harmonizing? couldn't we have been harmonizing? couldn't you have been harmonizing? couldn't they have been harmonizing?