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