English verb conjugation
COULD DESULFERISE

Regular verb: desulferise - desulferised - desulferised

Affirmation

Simple form	V-ing form
I could desulferise you could desulferise he could desulferise we could desulferise you could desulferise they could desulferise	I could be desulferising you could be desulferising he could be desulferising we could be desulferising you could be desulferising they could be desulferising
Perfect	V-ing perfect
I could have desulferised you could have desulferised he could have desulferised we could have desulferised you could have desulferised they could have desulferised	I could have been desulferising you could have been desulferising he could have been desulferising we could have been desulferising you could have been desulferising they could have been desulferising

Negation

Simple form	V-ing form
I could not desulferise you could not desulferise he could not desulferise we could not desulferise you could not desulferise they could not desulferise	I could not be desulferising you could not be desulferising he could not be desulferising we could not be desulferising you could not be desulferising they could not be desulferising
Perfect	V-ing perfect
I could not have desulferised you could not have desulferised he could not have desulferised we could not have desulferised you could not have desulferised they could not have desulferised	I could not have been desulferising you could not have been desulferising he could not have been desulferising we could not have been desulferising you could not have been desulferising they could not have been desulferising

Interrogative form

Simple form	V-ing form
could I desulferise? could you desulferise? could he desulferise? could we desulferise? could you desulferise? could they desulferise?	could I be desulferising? could you be desulferising? could he be desulferising? could we be desulferising? could you be desulferising? could they be desulferising?
Perfect	V-ing perfect
could I have desulferised? could you have desulferised? could he have desulferised? could we have desulferised? could you have desulferised? could they have desulferised?	could I have been desulferising? could you have been desulferising? could he have been desulferising? could we have been desulferising? could you have been desulferising? could they have been desulferising?

Interro-negative form

Simple form	V-ing form
could I not desulferise? could you not desulferise? could he not desulferise? could we not desulferise? could you not desulferise? could they not desulferise?	could I not be desulferising? could you not be desulferising? could he not be desulferising? could we not be desulferising? could you not be desulferising? could they not be desulferising?
Perfect	V-ing perfect
could I not have desulferised? could you not have desulferised? could he not have desulferised? could we not have desulferised? could you not have desulferised? could they not have desulferised?	could I not have been desulferising? could you not have been desulferising? could he not have been desulferising? could we not have been desulferising? could you not have been desulferising? could they not have been desulferising?