I could conclude you could conclude he could conclude we could conclude you could conclude they could conclude
V-ing form
I could be concluding you could be concluding he could be concluding we could be concluding you could be concluding they could be concluding
Perfect
I could have concluded you could have concluded he could have concluded we could have concluded you could have concluded they could have concluded
V-ing perfect
I could have been concluding you could have been concluding he could have been concluding we could have been concluding you could have been concluding they could have been concluding
Negation
Simple form
I could not conclude you could not conclude he could not conclude we could not conclude you could not conclude they could not conclude
V-ing form
I could not be concluding you could not be concluding he could not be concluding we could not be concluding you could not be concluding they could not be concluding
Perfect
I could not have concluded you could not have concluded he could not have concluded we could not have concluded you could not have concluded they could not have concluded
V-ing perfect
I could not have been concluding you could not have been concluding he could not have been concluding we could not have been concluding you could not have been concluding they could not have been concluding
Interrogative form
Simple form
could I conclude? could you conclude? could he conclude? could we conclude? could you conclude? could they conclude?
V-ing form
could I be concluding? could you be concluding? could he be concluding? could we be concluding? could you be concluding? could they be concluding?
Perfect
could I have concluded? could you have concluded? could he have concluded? could we have concluded? could you have concluded? could they have concluded?
V-ing perfect
could I have been concluding? could you have been concluding? could he have been concluding? could we have been concluding? could you have been concluding? could they have been concluding?
Interro-negative form
Simple form
could I not conclude? could you not conclude? could he not conclude? could we not conclude? could you not conclude? could they not conclude?
V-ing form
could I not be concluding? could you not be concluding? could he not be concluding? could we not be concluding? could you not be concluding? could they not be concluding?
Perfect
could I not have concluded? could you not have concluded? could he not have concluded? could we not have concluded? could you not have concluded? could they not have concluded?
V-ing perfect
could I not have been concluding? could you not have been concluding? could he not have been concluding? could we not have been concluding? could you not have been concluding? could they not have been concluding?