English verb conjugation
COULD EFFERVESCE

Regular verb: effervesce - effervesced - effervesced

Affirmation

Simple form	V-ing form
I could effervesce you could effervesce he could effervesce we could effervesce you could effervesce they could effervesce	I could be effervescing you could be effervescing he could be effervescing we could be effervescing you could be effervescing they could be effervescing
Perfect	V-ing perfect
I could have effervesced you could have effervesced he could have effervesced we could have effervesced you could have effervesced they could have effervesced	I could have been effervescing you could have been effervescing he could have been effervescing we could have been effervescing you could have been effervescing they could have been effervescing

Negation

Simple form	V-ing form
I couldn't effervesce you couldn't effervesce he couldn't effervesce we couldn't effervesce you couldn't effervesce they couldn't effervesce	I couldn't be effervescing you couldn't be effervescing he couldn't be effervescing we couldn't be effervescing you couldn't be effervescing they couldn't be effervescing
Perfect	V-ing perfect
I couldn't have effervesced you couldn't have effervesced he couldn't have effervesced we couldn't have effervesced you couldn't have effervesced they couldn't have effervesced	I couldn't have been effervescing you couldn't have been effervescing he couldn't have been effervescing we couldn't have been effervescing you couldn't have been effervescing they couldn't have been effervescing

Interrogative form

Simple form	V-ing form
could I effervesce? could you effervesce? could he effervesce? could we effervesce? could you effervesce? could they effervesce?	could I be effervescing? could you be effervescing? could he be effervescing? could we be effervescing? could you be effervescing? could they be effervescing?
Perfect	V-ing perfect
could I have effervesced? could you have effervesced? could he have effervesced? could we have effervesced? could you have effervesced? could they have effervesced?	could I have been effervescing? could you have been effervescing? could he have been effervescing? could we have been effervescing? could you have been effervescing? could they have been effervescing?

Interro-negative form

Simple form	V-ing form
couldn't I effervesce? couldn't you effervesce? couldn't he effervesce? couldn't we effervesce? couldn't you effervesce? couldn't they effervesce?	couldn't I be effervescing? couldn't you be effervescing? couldn't he be effervescing? couldn't we be effervescing? couldn't you be effervescing? couldn't they be effervescing?
Perfect	V-ing perfect
couldn't I have effervesced? couldn't you have effervesced? couldn't he have effervesced? couldn't we have effervesced? couldn't you have effervesced? couldn't they have effervesced?	couldn't I have been effervescing? couldn't you have been effervescing? couldn't he have been effervescing? couldn't we have been effervescing? couldn't you have been effervescing? couldn't they have been effervescing?