English verb conjugation
COULD OVERFERTILISE

Regular verb: overfertilise - overfertilised - overfertilised

Affirmation

Simple form	V-ing form
I could overfertilise you could overfertilise she could overfertilise we could overfertilise you could overfertilise they could overfertilise	I could be overfertilising you could be overfertilising she 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 she 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 she 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 she 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 she 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 she 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 she 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 she overfertilise? could we overfertilise? could you overfertilise? could they overfertilise?	could I be overfertilising? could you be overfertilising? could she 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 she 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 she 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 she 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 she 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 she 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 she have been overfertilising? couldn't we have been overfertilising? couldn't you have been overfertilising? couldn't they have been overfertilising?