I could planish you could planish he could planish we could planish you could planish they could planish
V-ing form
I could be planishing you could be planishing he could be planishing we could be planishing you could be planishing they could be planishing
Perfect
I could have planished you could have planished he could have planished we could have planished you could have planished they could have planished
V-ing perfect
I could have been planishing you could have been planishing he could have been planishing we could have been planishing you could have been planishing they could have been planishing
Negation
Simple form
I could not planish you could not planish he could not planish we could not planish you could not planish they could not planish
V-ing form
I could not be planishing you could not be planishing he could not be planishing we could not be planishing you could not be planishing they could not be planishing
Perfect
I could not have planished you could not have planished he could not have planished we could not have planished you could not have planished they could not have planished
V-ing perfect
I could not have been planishing you could not have been planishing he could not have been planishing we could not have been planishing you could not have been planishing they could not have been planishing
Interrogative form
Simple form
could I planish? could you planish? could he planish? could we planish? could you planish? could they planish?
V-ing form
could I be planishing? could you be planishing? could he be planishing? could we be planishing? could you be planishing? could they be planishing?
Perfect
could I have planished? could you have planished? could he have planished? could we have planished? could you have planished? could they have planished?
V-ing perfect
could I have been planishing? could you have been planishing? could he have been planishing? could we have been planishing? could you have been planishing? could they have been planishing?
Interro-negative form
Simple form
could I not planish? could you not planish? could he not planish? could we not planish? could you not planish? could they not planish?
V-ing form
could I not be planishing? could you not be planishing? could he not be planishing? could we not be planishing? could you not be planishing? could they not be planishing?
Perfect
could I not have planished? could you not have planished? could he not have planished? could we not have planished? could you not have planished? could they not have planished?
V-ing perfect
could I not have been planishing? could you not have been planishing? could he not have been planishing? could we not have been planishing? could you not have been planishing? could they not have been planishing?