English verb conjugation
COULD OVERFERTILISE

Regular verb: overfertilise - overfertilised - overfertilised

Affirmation

Simple form	V-ing form
I could overfertilise you could overfertilise he could overfertilise we could overfertilise you could overfertilise they could overfertilise	I could be overfertilising you could be overfertilising he could be overfertilising we could be overfertilising you could be overfertilising they could be overfertilising
Perfect	V-ing perfect
I could have overfertilised you could have overfertilised he could have overfertilised we could have overfertilised you could have overfertilised they could have overfertilised	I could have been overfertilising you could have been overfertilising he could have been overfertilising we could have been overfertilising you could have been overfertilising they could have been overfertilising

Negation

Simple form	V-ing form
I couldn't overfertilise you couldn't overfertilise he couldn't overfertilise we couldn't overfertilise you couldn't overfertilise they couldn't overfertilise	I couldn't be overfertilising you couldn't be overfertilising he couldn't be overfertilising we couldn't be overfertilising you couldn't be overfertilising they couldn't be overfertilising
Perfect	V-ing perfect
I couldn't have overfertilised you couldn't have overfertilised he couldn't have overfertilised we couldn't have overfertilised you couldn't have overfertilised they couldn't have overfertilised	I couldn't have been overfertilising you couldn't have been overfertilising he couldn't have been overfertilising we couldn't have been overfertilising you couldn't have been overfertilising they couldn't have been overfertilising

Interrogative form

Simple form	V-ing form
could I overfertilise? could you overfertilise? could he overfertilise? could we overfertilise? could you overfertilise? could they overfertilise?	could I be overfertilising? could you be overfertilising? could he be overfertilising? could we be overfertilising? could you be overfertilising? could they be overfertilising?
Perfect	V-ing perfect
could I have overfertilised? could you have overfertilised? could he have overfertilised? could we have overfertilised? could you have overfertilised? could they have overfertilised?	could I have been overfertilising? could you have been overfertilising? could he have been overfertilising? could we have been overfertilising? could you have been overfertilising? could they have been overfertilising?

Interro-negative form

Simple form	V-ing form
couldn't I overfertilise? couldn't you overfertilise? couldn't he overfertilise? couldn't we overfertilise? couldn't you overfertilise? couldn't they overfertilise?	couldn't I be overfertilising? couldn't you be overfertilising? couldn't he be overfertilising? couldn't we be overfertilising? couldn't you be overfertilising? couldn't they be overfertilising?
Perfect	V-ing perfect
couldn't I have overfertilised? couldn't you have overfertilised? couldn't he have overfertilised? couldn't we have overfertilised? couldn't you have overfertilised? couldn't they have overfertilised?	couldn't I have been overfertilising? couldn't you have been overfertilising? couldn't he have been overfertilising? couldn't we have been overfertilising? couldn't you have been overfertilising? couldn't they have been overfertilising?