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