English verb conjugation
COULD PRESTERILISE

Regular verb: presterilise - presterilised - presterilised

Affirmation

Simple form	V-ing form
I could presterilise you could presterilise he could presterilise we could presterilise you could presterilise they could presterilise	I could be presterilising you could be presterilising he could be presterilising we could be presterilising you could be presterilising they could be presterilising
Perfect	V-ing perfect
I could have presterilised you could have presterilised he could have presterilised we could have presterilised you could have presterilised they could have presterilised	I could have been presterilising you could have been presterilising he could have been presterilising we could have been presterilising you could have been presterilising they could have been presterilising

Negation

Simple form	V-ing form
I couldn't presterilise you couldn't presterilise he couldn't presterilise we couldn't presterilise you couldn't presterilise they couldn't presterilise	I couldn't be presterilising you couldn't be presterilising he couldn't be presterilising we couldn't be presterilising you couldn't be presterilising they couldn't be presterilising
Perfect	V-ing perfect
I couldn't have presterilised you couldn't have presterilised he couldn't have presterilised we couldn't have presterilised you couldn't have presterilised they couldn't have presterilised	I couldn't have been presterilising you couldn't have been presterilising he couldn't have been presterilising we couldn't have been presterilising you couldn't have been presterilising they couldn't have been presterilising

Interrogative form

Simple form	V-ing form
could I presterilise? could you presterilise? could he presterilise? could we presterilise? could you presterilise? could they presterilise?	could I be presterilising? could you be presterilising? could he be presterilising? could we be presterilising? could you be presterilising? could they be presterilising?
Perfect	V-ing perfect
could I have presterilised? could you have presterilised? could he have presterilised? could we have presterilised? could you have presterilised? could they have presterilised?	could I have been presterilising? could you have been presterilising? could he have been presterilising? could we have been presterilising? could you have been presterilising? could they have been presterilising?

Interro-negative form

Simple form	V-ing form
couldn't I presterilise? couldn't you presterilise? couldn't he presterilise? couldn't we presterilise? couldn't you presterilise? couldn't they presterilise?	couldn't I be presterilising? couldn't you be presterilising? couldn't he be presterilising? couldn't we be presterilising? couldn't you be presterilising? couldn't they be presterilising?
Perfect	V-ing perfect
couldn't I have presterilised? couldn't you have presterilised? couldn't he have presterilised? couldn't we have presterilised? couldn't you have presterilised? couldn't they have presterilised?	couldn't I have been presterilising? couldn't you have been presterilising? couldn't he have been presterilising? couldn't we have been presterilising? couldn't you have been presterilising? couldn't they have been presterilising?