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