English verb conjugation
COULD DEEPEN

Regular verb: deepen - deepened - deepened

Affirmation

Simple form	V-ing form
I could deepen you could deepen he could deepen we could deepen you could deepen they could deepen	I could be deepening you could be deepening he could be deepening we could be deepening you could be deepening they could be deepening
Perfect	V-ing perfect
I could have deepened you could have deepened he could have deepened we could have deepened you could have deepened they could have deepened	I could have been deepening you could have been deepening he could have been deepening we could have been deepening you could have been deepening they could have been deepening

Negation

Simple form	V-ing form
I couldn't deepen you couldn't deepen he couldn't deepen we couldn't deepen you couldn't deepen they couldn't deepen	I couldn't be deepening you couldn't be deepening he couldn't be deepening we couldn't be deepening you couldn't be deepening they couldn't be deepening
Perfect	V-ing perfect
I couldn't have deepened you couldn't have deepened he couldn't have deepened we couldn't have deepened you couldn't have deepened they couldn't have deepened	I couldn't have been deepening you couldn't have been deepening he couldn't have been deepening we couldn't have been deepening you couldn't have been deepening they couldn't have been deepening

Interrogative form

Simple form	V-ing form
could I deepen? could you deepen? could he deepen? could we deepen? could you deepen? could they deepen?	could I be deepening? could you be deepening? could he be deepening? could we be deepening? could you be deepening? could they be deepening?
Perfect	V-ing perfect
could I have deepened? could you have deepened? could he have deepened? could we have deepened? could you have deepened? could they have deepened?	could I have been deepening? could you have been deepening? could he have been deepening? could we have been deepening? could you have been deepening? could they have been deepening?

Interro-negative form

Simple form	V-ing form
couldn't I deepen? couldn't you deepen? couldn't he deepen? couldn't we deepen? couldn't you deepen? couldn't they deepen?	couldn't I be deepening? couldn't you be deepening? couldn't he be deepening? couldn't we be deepening? couldn't you be deepening? couldn't they be deepening?
Perfect	V-ing perfect
couldn't I have deepened? couldn't you have deepened? couldn't he have deepened? couldn't we have deepened? couldn't you have deepened? couldn't they have deepened?	couldn't I have been deepening? couldn't you have been deepening? couldn't he have been deepening? couldn't we have been deepening? couldn't you have been deepening? couldn't they have been deepening?