I could puree you could puree she could puree we could puree you could puree they could puree
V-ing form
I could be pureeing you could be pureeing she could be pureeing we could be pureeing you could be pureeing they could be pureeing
Perfect
I could have pureed you could have pureed she could have pureed we could have pureed you could have pureed they could have pureed
V-ing perfect
I could have been pureeing you could have been pureeing she could have been pureeing we could have been pureeing you could have been pureeing they could have been pureeing
Negation
Simple form
I could not puree you could not puree she could not puree we could not puree you could not puree they could not puree
V-ing form
I could not be pureeing you could not be pureeing she could not be pureeing we could not be pureeing you could not be pureeing they could not be pureeing
Perfect
I could not have pureed you could not have pureed she could not have pureed we could not have pureed you could not have pureed they could not have pureed
V-ing perfect
I could not have been pureeing you could not have been pureeing she could not have been pureeing we could not have been pureeing you could not have been pureeing they could not have been pureeing
Interrogative form
Simple form
could I puree? could you puree? could she puree? could we puree? could you puree? could they puree?
V-ing form
could I be pureeing? could you be pureeing? could she be pureeing? could we be pureeing? could you be pureeing? could they be pureeing?
Perfect
could I have pureed? could you have pureed? could she have pureed? could we have pureed? could you have pureed? could they have pureed?
V-ing perfect
could I have been pureeing? could you have been pureeing? could she have been pureeing? could we have been pureeing? could you have been pureeing? could they have been pureeing?
Interro-negative form
Simple form
could I not puree? could you not puree? could she not puree? could we not puree? could you not puree? could they not puree?
V-ing form
could I not be pureeing? could you not be pureeing? could she not be pureeing? could we not be pureeing? could you not be pureeing? could they not be pureeing?
Perfect
could I not have pureed? could you not have pureed? could she not have pureed? could we not have pureed? could you not have pureed? could they not have pureed?
V-ing perfect
could I not have been pureeing? could you not have been pureeing? could she not have been pureeing? could we not have been pureeing? could you not have been pureeing? could they not have been pureeing?