Warning, this verb may not exist. Conjugation is given as example.
Affirmation
Simple form
I could do dive you could do dive he could do dive we could do dive you could do dive they could do dive
V-ing form
I could be do diving you could be do diving he could be do diving we could be do diving you could be do diving they could be do diving
Perfect
I could have do dived you could have do dived he could have do dived we could have do dived you could have do dived they could have do dived
V-ing perfect
I could have been do diving you could have been do diving he could have been do diving we could have been do diving you could have been do diving they could have been do diving
Negation
Simple form
I couldn't do dive you couldn't do dive he couldn't do dive we couldn't do dive you couldn't do dive they couldn't do dive
V-ing form
I couldn't be do diving you couldn't be do diving he couldn't be do diving we couldn't be do diving you couldn't be do diving they couldn't be do diving
Perfect
I couldn't have do dived you couldn't have do dived he couldn't have do dived we couldn't have do dived you couldn't have do dived they couldn't have do dived
V-ing perfect
I couldn't have been do diving you couldn't have been do diving he couldn't have been do diving we couldn't have been do diving you couldn't have been do diving they couldn't have been do diving
Interrogative form
Simple form
could I do dive? could you do dive? could he do dive? could we do dive? could you do dive? could they do dive?
V-ing form
could I be do diving? could you be do diving? could he be do diving? could we be do diving? could you be do diving? could they be do diving?
Perfect
could I have do dived? could you have do dived? could he have do dived? could we have do dived? could you have do dived? could they have do dived?
V-ing perfect
could I have been do diving? could you have been do diving? could he have been do diving? could we have been do diving? could you have been do diving? could they have been do diving?
Interro-negative form
Simple form
couldn't I do dive? couldn't you do dive? couldn't he do dive? couldn't we do dive? couldn't you do dive? couldn't they do dive?
V-ing form
couldn't I be do diving? couldn't you be do diving? couldn't he be do diving? couldn't we be do diving? couldn't you be do diving? couldn't they be do diving?
Perfect
couldn't I have do dived? couldn't you have do dived? couldn't he have do dived? couldn't we have do dived? couldn't you have do dived? couldn't they have do dived?
V-ing perfect
couldn't I have been do diving? couldn't you have been do diving? couldn't he have been do diving? couldn't we have been do diving? couldn't you have been do diving? couldn't they have been do diving?