English verb conjugation
COULD SULFATE

Regular verb: sulfate - sulfated - sulfated

Affirmation

Simple form	V-ing form
I could sulfate you could sulfate he could sulfate we could sulfate you could sulfate they could sulfate	I could be sulfating you could be sulfating he could be sulfating we could be sulfating you could be sulfating they could be sulfating
Perfect	V-ing perfect
I could have sulfated you could have sulfated he could have sulfated we could have sulfated you could have sulfated they could have sulfated	I could have been sulfating you could have been sulfating he could have been sulfating we could have been sulfating you could have been sulfating they could have been sulfating

Negation

Simple form	V-ing form
I couldn't sulfate you couldn't sulfate he couldn't sulfate we couldn't sulfate you couldn't sulfate they couldn't sulfate	I couldn't be sulfating you couldn't be sulfating he couldn't be sulfating we couldn't be sulfating you couldn't be sulfating they couldn't be sulfating
Perfect	V-ing perfect
I couldn't have sulfated you couldn't have sulfated he couldn't have sulfated we couldn't have sulfated you couldn't have sulfated they couldn't have sulfated	I couldn't have been sulfating you couldn't have been sulfating he couldn't have been sulfating we couldn't have been sulfating you couldn't have been sulfating they couldn't have been sulfating

Interrogative form

Simple form	V-ing form
could I sulfate? could you sulfate? could he sulfate? could we sulfate? could you sulfate? could they sulfate?	could I be sulfating? could you be sulfating? could he be sulfating? could we be sulfating? could you be sulfating? could they be sulfating?
Perfect	V-ing perfect
could I have sulfated? could you have sulfated? could he have sulfated? could we have sulfated? could you have sulfated? could they have sulfated?	could I have been sulfating? could you have been sulfating? could he have been sulfating? could we have been sulfating? could you have been sulfating? could they have been sulfating?

Interro-negative form

Simple form	V-ing form
couldn't I sulfate? couldn't you sulfate? couldn't he sulfate? couldn't we sulfate? couldn't you sulfate? couldn't they sulfate?	couldn't I be sulfating? couldn't you be sulfating? couldn't he be sulfating? couldn't we be sulfating? couldn't you be sulfating? couldn't they be sulfating?
Perfect	V-ing perfect
couldn't I have sulfated? couldn't you have sulfated? couldn't he have sulfated? couldn't we have sulfated? couldn't you have sulfated? couldn't they have sulfated?	couldn't I have been sulfating? couldn't you have been sulfating? couldn't he have been sulfating? couldn't we have been sulfating? couldn't you have been sulfating? couldn't they have been sulfating?