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