I could medicate you could medicate he could medicate we could medicate you could medicate they could medicate
V-ing form
I could be medicating you could be medicating he could be medicating we could be medicating you could be medicating they could be medicating
Perfect
I could have medicated you could have medicated he could have medicated we could have medicated you could have medicated they could have medicated
V-ing perfect
I could have been medicating you could have been medicating he could have been medicating we could have been medicating you could have been medicating they could have been medicating
Negation
Simple form
I could not medicate you could not medicate he could not medicate we could not medicate you could not medicate they could not medicate
V-ing form
I could not be medicating you could not be medicating he could not be medicating we could not be medicating you could not be medicating they could not be medicating
Perfect
I could not have medicated you could not have medicated he could not have medicated we could not have medicated you could not have medicated they could not have medicated
V-ing perfect
I could not have been medicating you could not have been medicating he could not have been medicating we could not have been medicating you could not have been medicating they could not have been medicating
Interrogative form
Simple form
could I medicate? could you medicate? could he medicate? could we medicate? could you medicate? could they medicate?
V-ing form
could I be medicating? could you be medicating? could he be medicating? could we be medicating? could you be medicating? could they be medicating?
Perfect
could I have medicated? could you have medicated? could he have medicated? could we have medicated? could you have medicated? could they have medicated?
V-ing perfect
could I have been medicating? could you have been medicating? could he have been medicating? could we have been medicating? could you have been medicating? could they have been medicating?
Interro-negative form
Simple form
could I not medicate? could you not medicate? could he not medicate? could we not medicate? could you not medicate? could they not medicate?
V-ing form
could I not be medicating? could you not be medicating? could he not be medicating? could we not be medicating? could you not be medicating? could they not be medicating?
Perfect
could I not have medicated? could you not have medicated? could he not have medicated? could we not have medicated? could you not have medicated? could they not have medicated?
V-ing perfect
could I not have been medicating? could you not have been medicating? could he not have been medicating? could we not have been medicating? could you not have been medicating? could they not have been medicating?