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