I could snowshoe you could snowshoe he could snowshoe we could snowshoe you could snowshoe they could snowshoe
V-ing form
I could be snowshoing you could be snowshoing he could be snowshoing we could be snowshoing you could be snowshoing they could be snowshoing
Perfect
I could have snowshoed you could have snowshoed he could have snowshoed we could have snowshoed you could have snowshoed they could have snowshoed
V-ing perfect
I could have been snowshoing you could have been snowshoing he could have been snowshoing we could have been snowshoing you could have been snowshoing they could have been snowshoing
Negation
Simple form
I could not snowshoe you could not snowshoe he could not snowshoe we could not snowshoe you could not snowshoe they could not snowshoe
V-ing form
I could not be snowshoing you could not be snowshoing he could not be snowshoing we could not be snowshoing you could not be snowshoing they could not be snowshoing
Perfect
I could not have snowshoed you could not have snowshoed he could not have snowshoed we could not have snowshoed you could not have snowshoed they could not have snowshoed
V-ing perfect
I could not have been snowshoing you could not have been snowshoing he could not have been snowshoing we could not have been snowshoing you could not have been snowshoing they could not have been snowshoing
Interrogative form
Simple form
could I snowshoe? could you snowshoe? could he snowshoe? could we snowshoe? could you snowshoe? could they snowshoe?
V-ing form
could I be snowshoing? could you be snowshoing? could he be snowshoing? could we be snowshoing? could you be snowshoing? could they be snowshoing?
Perfect
could I have snowshoed? could you have snowshoed? could he have snowshoed? could we have snowshoed? could you have snowshoed? could they have snowshoed?
V-ing perfect
could I have been snowshoing? could you have been snowshoing? could he have been snowshoing? could we have been snowshoing? could you have been snowshoing? could they have been snowshoing?
Interro-negative form
Simple form
could I not snowshoe? could you not snowshoe? could he not snowshoe? could we not snowshoe? could you not snowshoe? could they not snowshoe?
V-ing form
could I not be snowshoing? could you not be snowshoing? could he not be snowshoing? could we not be snowshoing? could you not be snowshoing? could they not be snowshoing?
Perfect
could I not have snowshoed? could you not have snowshoed? could he not have snowshoed? could we not have snowshoed? could you not have snowshoed? could they not have snowshoed?
V-ing perfect
could I not have been snowshoing? could you not have been snowshoing? could he not have been snowshoing? could we not have been snowshoing? could you not have been snowshoing? could they not have been snowshoing?