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