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