Warning, this verb may not exist. Conjugation is given as example.
Affirmation
Simple form
I could read.htm you could read.htm he could read.htm we could read.htm you could read.htm they could read.htm
V-ing form
I could be read.htming you could be read.htming he could be read.htming we could be read.htming you could be read.htming they could be read.htming
Perfect
I could have read.htmed you could have read.htmed he could have read.htmed we could have read.htmed you could have read.htmed they could have read.htmed
V-ing perfect
I could have been read.htming you could have been read.htming he could have been read.htming we could have been read.htming you could have been read.htming they could have been read.htming
Negation
Simple form
I could not read.htm you could not read.htm he could not read.htm we could not read.htm you could not read.htm they could not read.htm
V-ing form
I could not be read.htming you could not be read.htming he could not be read.htming we could not be read.htming you could not be read.htming they could not be read.htming
Perfect
I could not have read.htmed you could not have read.htmed he could not have read.htmed we could not have read.htmed you could not have read.htmed they could not have read.htmed
V-ing perfect
I could not have been read.htming you could not have been read.htming he could not have been read.htming we could not have been read.htming you could not have been read.htming they could not have been read.htming
Interrogative form
Simple form
could I read.htm? could you read.htm? could he read.htm? could we read.htm? could you read.htm? could they read.htm?
V-ing form
could I be read.htming? could you be read.htming? could he be read.htming? could we be read.htming? could you be read.htming? could they be read.htming?
Perfect
could I have read.htmed? could you have read.htmed? could he have read.htmed? could we have read.htmed? could you have read.htmed? could they have read.htmed?
V-ing perfect
could I have been read.htming? could you have been read.htming? could he have been read.htming? could we have been read.htming? could you have been read.htming? could they have been read.htming?
Interro-negative form
Simple form
could I not read.htm? could you not read.htm? could he not read.htm? could we not read.htm? could you not read.htm? could they not read.htm?
V-ing form
could I not be read.htming? could you not be read.htming? could he not be read.htming? could we not be read.htming? could you not be read.htming? could they not be read.htming?
Perfect
could I not have read.htmed? could you not have read.htmed? could he not have read.htmed? could we not have read.htmed? could you not have read.htmed? could they not have read.htmed?
V-ing perfect
could I not have been read.htming? could you not have been read.htming? could he not have been read.htming? could we not have been read.htming? could you not have been read.htming? could they not have been read.htming?