I could task you could task he could task we could task you could task they could task
V-ing form
I could be tasking you could be tasking he could be tasking we could be tasking you could be tasking they could be tasking
Perfect
I could have tasked you could have tasked he could have tasked we could have tasked you could have tasked they could have tasked
V-ing perfect
I could have been tasking you could have been tasking he could have been tasking we could have been tasking you could have been tasking they could have been tasking
Negation
Simple form
I could not task you could not task he could not task we could not task you could not task they could not task
V-ing form
I could not be tasking you could not be tasking he could not be tasking we could not be tasking you could not be tasking they could not be tasking
Perfect
I could not have tasked you could not have tasked he could not have tasked we could not have tasked you could not have tasked they could not have tasked
V-ing perfect
I could not have been tasking you could not have been tasking he could not have been tasking we could not have been tasking you could not have been tasking they could not have been tasking
Interrogative form
Simple form
could I task? could you task? could he task? could we task? could you task? could they task?
V-ing form
could I be tasking? could you be tasking? could he be tasking? could we be tasking? could you be tasking? could they be tasking?
Perfect
could I have tasked? could you have tasked? could he have tasked? could we have tasked? could you have tasked? could they have tasked?
V-ing perfect
could I have been tasking? could you have been tasking? could he have been tasking? could we have been tasking? could you have been tasking? could they have been tasking?
Interro-negative form
Simple form
could I not task? could you not task? could he not task? could we not task? could you not task? could they not task?
V-ing form
could I not be tasking? could you not be tasking? could he not be tasking? could we not be tasking? could you not be tasking? could they not be tasking?
Perfect
could I not have tasked? could you not have tasked? could he not have tasked? could we not have tasked? could you not have tasked? could they not have tasked?
V-ing perfect
could I not have been tasking? could you not have been tasking? could he not have been tasking? could we not have been tasking? could you not have been tasking? could they not have been tasking?