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