English verb conjugation
COULD SULFURISE

Regular verb: sulfurise - sulfurised - sulfurised

Affirmation

Simple form	V-ing form
I could sulfurise you could sulfurise he could sulfurise we could sulfurise you could sulfurise they could sulfurise	I could be sulfurising you could be sulfurising he could be sulfurising we could be sulfurising you could be sulfurising they could be sulfurising
Perfect	V-ing perfect
I could have sulfurised you could have sulfurised he could have sulfurised we could have sulfurised you could have sulfurised they could have sulfurised	I could have been sulfurising you could have been sulfurising he could have been sulfurising we could have been sulfurising you could have been sulfurising they could have been sulfurising

Negation

Simple form	V-ing form
I couldn't sulfurise you couldn't sulfurise he couldn't sulfurise we couldn't sulfurise you couldn't sulfurise they couldn't sulfurise	I couldn't be sulfurising you couldn't be sulfurising he couldn't be sulfurising we couldn't be sulfurising you couldn't be sulfurising they couldn't be sulfurising
Perfect	V-ing perfect
I couldn't have sulfurised you couldn't have sulfurised he couldn't have sulfurised we couldn't have sulfurised you couldn't have sulfurised they couldn't have sulfurised	I couldn't have been sulfurising you couldn't have been sulfurising he couldn't have been sulfurising we couldn't have been sulfurising you couldn't have been sulfurising they couldn't have been sulfurising

Interrogative form

Simple form	V-ing form
could I sulfurise? could you sulfurise? could he sulfurise? could we sulfurise? could you sulfurise? could they sulfurise?	could I be sulfurising? could you be sulfurising? could he be sulfurising? could we be sulfurising? could you be sulfurising? could they be sulfurising?
Perfect	V-ing perfect
could I have sulfurised? could you have sulfurised? could he have sulfurised? could we have sulfurised? could you have sulfurised? could they have sulfurised?	could I have been sulfurising? could you have been sulfurising? could he have been sulfurising? could we have been sulfurising? could you have been sulfurising? could they have been sulfurising?

Interro-negative form

Simple form	V-ing form
couldn't I sulfurise? couldn't you sulfurise? couldn't he sulfurise? couldn't we sulfurise? couldn't you sulfurise? couldn't they sulfurise?	couldn't I be sulfurising? couldn't you be sulfurising? couldn't he be sulfurising? couldn't we be sulfurising? couldn't you be sulfurising? couldn't they be sulfurising?
Perfect	V-ing perfect
couldn't I have sulfurised? couldn't you have sulfurised? couldn't he have sulfurised? couldn't we have sulfurised? couldn't you have sulfurised? couldn't they have sulfurised?	couldn't I have been sulfurising? couldn't you have been sulfurising? couldn't he have been sulfurising? couldn't we have been sulfurising? couldn't you have been sulfurising? couldn't they have been sulfurising?