English verb conjugation
COULD DIP

Regular verb: dip - diped - diped

Affirmation

Simple form	V-ing form
I could dip you could dip he could dip we could dip you could dip they could dip	I could be diping you could be diping he could be diping we could be diping you could be diping they could be diping
Perfect	V-ing perfect
I could have diped you could have diped he could have diped we could have diped you could have diped they could have diped	I could have been diping you could have been diping he could have been diping we could have been diping you could have been diping they could have been diping

Negation

Simple form	V-ing form
I couldn't dip you couldn't dip he couldn't dip we couldn't dip you couldn't dip they couldn't dip	I couldn't be diping you couldn't be diping he couldn't be diping we couldn't be diping you couldn't be diping they couldn't be diping
Perfect	V-ing perfect
I couldn't have diped you couldn't have diped he couldn't have diped we couldn't have diped you couldn't have diped they couldn't have diped	I couldn't have been diping you couldn't have been diping he couldn't have been diping we couldn't have been diping you couldn't have been diping they couldn't have been diping

Interrogative form

Simple form	V-ing form
could I dip? could you dip? could he dip? could we dip? could you dip? could they dip?	could I be diping? could you be diping? could he be diping? could we be diping? could you be diping? could they be diping?
Perfect	V-ing perfect
could I have diped? could you have diped? could he have diped? could we have diped? could you have diped? could they have diped?	could I have been diping? could you have been diping? could he have been diping? could we have been diping? could you have been diping? could they have been diping?

Interro-negative form

Simple form	V-ing form
couldn't I dip? couldn't you dip? couldn't he dip? couldn't we dip? couldn't you dip? couldn't they dip?	couldn't I be diping? couldn't you be diping? couldn't he be diping? couldn't we be diping? couldn't you be diping? couldn't they be diping?
Perfect	V-ing perfect
couldn't I have diped? couldn't you have diped? couldn't he have diped? couldn't we have diped? couldn't you have diped? couldn't they have diped?	couldn't I have been diping? couldn't you have been diping? couldn't he have been diping? couldn't we have been diping? couldn't you have been diping? couldn't they have been diping?