English verb conjugation
COULD OXIDISE

Regular verb: oxidise - oxidised - oxidised

Affirmation

Simple form	V-ing form
I could oxidise you could oxidise she could oxidise we could oxidise you could oxidise they could oxidise	I could be oxidising you could be oxidising she could be oxidising we could be oxidising you could be oxidising they could be oxidising
Perfect	V-ing perfect
I could have oxidised you could have oxidised she could have oxidised we could have oxidised you could have oxidised they could have oxidised	I could have been oxidising you could have been oxidising she could have been oxidising we could have been oxidising you could have been oxidising they could have been oxidising

Negation

Simple form	V-ing form
I couldn't oxidise you couldn't oxidise she couldn't oxidise we couldn't oxidise you couldn't oxidise they couldn't oxidise	I couldn't be oxidising you couldn't be oxidising she couldn't be oxidising we couldn't be oxidising you couldn't be oxidising they couldn't be oxidising
Perfect	V-ing perfect
I couldn't have oxidised you couldn't have oxidised she couldn't have oxidised we couldn't have oxidised you couldn't have oxidised they couldn't have oxidised	I couldn't have been oxidising you couldn't have been oxidising she couldn't have been oxidising we couldn't have been oxidising you couldn't have been oxidising they couldn't have been oxidising

Interrogative form

Simple form	V-ing form
could I oxidise? could you oxidise? could she oxidise? could we oxidise? could you oxidise? could they oxidise?	could I be oxidising? could you be oxidising? could she be oxidising? could we be oxidising? could you be oxidising? could they be oxidising?
Perfect	V-ing perfect
could I have oxidised? could you have oxidised? could she have oxidised? could we have oxidised? could you have oxidised? could they have oxidised?	could I have been oxidising? could you have been oxidising? could she have been oxidising? could we have been oxidising? could you have been oxidising? could they have been oxidising?

Interro-negative form

Simple form	V-ing form
couldn't I oxidise? couldn't you oxidise? couldn't she oxidise? couldn't we oxidise? couldn't you oxidise? couldn't they oxidise?	couldn't I be oxidising? couldn't you be oxidising? couldn't she be oxidising? couldn't we be oxidising? couldn't you be oxidising? couldn't they be oxidising?
Perfect	V-ing perfect
couldn't I have oxidised? couldn't you have oxidised? couldn't she have oxidised? couldn't we have oxidised? couldn't you have oxidised? couldn't they have oxidised?	couldn't I have been oxidising? couldn't you have been oxidising? couldn't she have been oxidising? couldn't we have been oxidising? couldn't you have been oxidising? couldn't they have been oxidising?