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