I could underexercise you could underexercise she could underexercise we could underexercise you could underexercise they could underexercise
V-ing form
I could be underexercising you could be underexercising she could be underexercising we could be underexercising you could be underexercising they could be underexercising
Perfect
I could have underexercised you could have underexercised she could have underexercised we could have underexercised you could have underexercised they could have underexercised
V-ing perfect
I could have been underexercising you could have been underexercising she could have been underexercising we could have been underexercising you could have been underexercising they could have been underexercising
Negation
Simple form
I could not underexercise you could not underexercise she could not underexercise we could not underexercise you could not underexercise they could not underexercise
V-ing form
I could not be underexercising you could not be underexercising she could not be underexercising we could not be underexercising you could not be underexercising they could not be underexercising
Perfect
I could not have underexercised you could not have underexercised she could not have underexercised we could not have underexercised you could not have underexercised they could not have underexercised
V-ing perfect
I could not have been underexercising you could not have been underexercising she could not have been underexercising we could not have been underexercising you could not have been underexercising they could not have been underexercising
Interrogative form
Simple form
could I underexercise? could you underexercise? could she underexercise? could we underexercise? could you underexercise? could they underexercise?
V-ing form
could I be underexercising? could you be underexercising? could she be underexercising? could we be underexercising? could you be underexercising? could they be underexercising?
Perfect
could I have underexercised? could you have underexercised? could she have underexercised? could we have underexercised? could you have underexercised? could they have underexercised?
V-ing perfect
could I have been underexercising? could you have been underexercising? could she have been underexercising? could we have been underexercising? could you have been underexercising? could they have been underexercising?
Interro-negative form
Simple form
could I not underexercise? could you not underexercise? could she not underexercise? could we not underexercise? could you not underexercise? could they not underexercise?
V-ing form
could I not be underexercising? could you not be underexercising? could she not be underexercising? could we not be underexercising? could you not be underexercising? could they not be underexercising?
Perfect
could I not have underexercised? could you not have underexercised? could she not have underexercised? could we not have underexercised? could you not have underexercised? could they not have underexercised?
V-ing perfect
could I not have been underexercising? could you not have been underexercising? could she not have been underexercising? could we not have been underexercising? could you not have been underexercising? could they not have been underexercising?