I could third-degree you could third-degree he could third-degree we could third-degree you could third-degree they could third-degree
V-ing form
I could be third-degreeing you could be third-degreeing he could be third-degreeing we could be third-degreeing you could be third-degreeing they could be third-degreeing
Perfect
I could have third-degreed you could have third-degreed he could have third-degreed we could have third-degreed you could have third-degreed they could have third-degreed
V-ing perfect
I could have been third-degreeing you could have been third-degreeing he could have been third-degreeing we could have been third-degreeing you could have been third-degreeing they could have been third-degreeing
Negation
Simple form
I could not third-degree you could not third-degree he could not third-degree we could not third-degree you could not third-degree they could not third-degree
V-ing form
I could not be third-degreeing you could not be third-degreeing he could not be third-degreeing we could not be third-degreeing you could not be third-degreeing they could not be third-degreeing
Perfect
I could not have third-degreed you could not have third-degreed he could not have third-degreed we could not have third-degreed you could not have third-degreed they could not have third-degreed
V-ing perfect
I could not have been third-degreeing you could not have been third-degreeing he could not have been third-degreeing we could not have been third-degreeing you could not have been third-degreeing they could not have been third-degreeing
Interrogative form
Simple form
could I third-degree? could you third-degree? could he third-degree? could we third-degree? could you third-degree? could they third-degree?
V-ing form
could I be third-degreeing? could you be third-degreeing? could he be third-degreeing? could we be third-degreeing? could you be third-degreeing? could they be third-degreeing?
Perfect
could I have third-degreed? could you have third-degreed? could he have third-degreed? could we have third-degreed? could you have third-degreed? could they have third-degreed?
V-ing perfect
could I have been third-degreeing? could you have been third-degreeing? could he have been third-degreeing? could we have been third-degreeing? could you have been third-degreeing? could they have been third-degreeing?
Interro-negative form
Simple form
could I not third-degree? could you not third-degree? could he not third-degree? could we not third-degree? could you not third-degree? could they not third-degree?
V-ing form
could I not be third-degreeing? could you not be third-degreeing? could he not be third-degreeing? could we not be third-degreeing? could you not be third-degreeing? could they not be third-degreeing?
Perfect
could I not have third-degreed? could you not have third-degreed? could he not have third-degreed? could we not have third-degreed? could you not have third-degreed? could they not have third-degreed?
V-ing perfect
could I not have been third-degreeing? could you not have been third-degreeing? could he not have been third-degreeing? could we not have been third-degreeing? could you not have been third-degreeing? could they not have been third-degreeing?