English verb conjugation
COULD CULTURE

Regular verb: culture - cultured - cultured

Affirmation

Simple form	V-ing form
I could culture you could culture he could culture we could culture you could culture they could culture	I could be culturing you could be culturing he could be culturing we could be culturing you could be culturing they could be culturing
Perfect	V-ing perfect
I could have cultured you could have cultured he could have cultured we could have cultured you could have cultured they could have cultured	I could have been culturing you could have been culturing he could have been culturing we could have been culturing you could have been culturing they could have been culturing

Negation

Simple form	V-ing form
I couldn't culture you couldn't culture he couldn't culture we couldn't culture you couldn't culture they couldn't culture	I couldn't be culturing you couldn't be culturing he couldn't be culturing we couldn't be culturing you couldn't be culturing they couldn't be culturing
Perfect	V-ing perfect
I couldn't have cultured you couldn't have cultured he couldn't have cultured we couldn't have cultured you couldn't have cultured they couldn't have cultured	I couldn't have been culturing you couldn't have been culturing he couldn't have been culturing we couldn't have been culturing you couldn't have been culturing they couldn't have been culturing

Interrogative form

Simple form	V-ing form
could I culture? could you culture? could he culture? could we culture? could you culture? could they culture?	could I be culturing? could you be culturing? could he be culturing? could we be culturing? could you be culturing? could they be culturing?
Perfect	V-ing perfect
could I have cultured? could you have cultured? could he have cultured? could we have cultured? could you have cultured? could they have cultured?	could I have been culturing? could you have been culturing? could he have been culturing? could we have been culturing? could you have been culturing? could they have been culturing?

Interro-negative form

Simple form	V-ing form
couldn't I culture? couldn't you culture? couldn't he culture? couldn't we culture? couldn't you culture? couldn't they culture?	couldn't I be culturing? couldn't you be culturing? couldn't he be culturing? couldn't we be culturing? couldn't you be culturing? couldn't they be culturing?
Perfect	V-ing perfect
couldn't I have cultured? couldn't you have cultured? couldn't he have cultured? couldn't we have cultured? couldn't you have cultured? couldn't they have cultured?	couldn't I have been culturing? couldn't you have been culturing? couldn't he have been culturing? couldn't we have been culturing? couldn't you have been culturing? couldn't they have been culturing?