English verb conjugation
COULD VULCANISE

Regular verb: vulcanise - vulcanised - vulcanised

Affirmation

Simple form	V-ing form
I could vulcanise you could vulcanise he could vulcanise we could vulcanise you could vulcanise they could vulcanise	I could be vulcanising you could be vulcanising he could be vulcanising we could be vulcanising you could be vulcanising they could be vulcanising
Perfect	V-ing perfect
I could have vulcanised you could have vulcanised he could have vulcanised we could have vulcanised you could have vulcanised they could have vulcanised	I could have been vulcanising you could have been vulcanising he could have been vulcanising we could have been vulcanising you could have been vulcanising they could have been vulcanising

Negation

Simple form	V-ing form
I couldn't vulcanise you couldn't vulcanise he couldn't vulcanise we couldn't vulcanise you couldn't vulcanise they couldn't vulcanise	I couldn't be vulcanising you couldn't be vulcanising he couldn't be vulcanising we couldn't be vulcanising you couldn't be vulcanising they couldn't be vulcanising
Perfect	V-ing perfect
I couldn't have vulcanised you couldn't have vulcanised he couldn't have vulcanised we couldn't have vulcanised you couldn't have vulcanised they couldn't have vulcanised	I couldn't have been vulcanising you couldn't have been vulcanising he couldn't have been vulcanising we couldn't have been vulcanising you couldn't have been vulcanising they couldn't have been vulcanising

Interrogative form

Simple form	V-ing form
could I vulcanise? could you vulcanise? could he vulcanise? could we vulcanise? could you vulcanise? could they vulcanise?	could I be vulcanising? could you be vulcanising? could he be vulcanising? could we be vulcanising? could you be vulcanising? could they be vulcanising?
Perfect	V-ing perfect
could I have vulcanised? could you have vulcanised? could he have vulcanised? could we have vulcanised? could you have vulcanised? could they have vulcanised?	could I have been vulcanising? could you have been vulcanising? could he have been vulcanising? could we have been vulcanising? could you have been vulcanising? could they have been vulcanising?

Interro-negative form

Simple form	V-ing form
couldn't I vulcanise? couldn't you vulcanise? couldn't he vulcanise? couldn't we vulcanise? couldn't you vulcanise? couldn't they vulcanise?	couldn't I be vulcanising? couldn't you be vulcanising? couldn't he be vulcanising? couldn't we be vulcanising? couldn't you be vulcanising? couldn't they be vulcanising?
Perfect	V-ing perfect
couldn't I have vulcanised? couldn't you have vulcanised? couldn't he have vulcanised? couldn't we have vulcanised? couldn't you have vulcanised? couldn't they have vulcanised?	couldn't I have been vulcanising? couldn't you have been vulcanising? couldn't he have been vulcanising? couldn't we have been vulcanising? couldn't you have been vulcanising? couldn't they have been vulcanising?