English verb conjugation
COULD OXIDISE

Regular verb: oxidise - oxidised - oxidised

Affirmation

Simple form	V-ing form
I could oxidise you could oxidise he could oxidise we could oxidise you could oxidise they could oxidise	I could be oxidising you could be oxidising he 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 he 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 he 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 he 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 he 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 he 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 he 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 he oxidise? could we oxidise? could you oxidise? could they oxidise?	could I be oxidising? could you be oxidising? could he 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 he 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 he 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 he 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 he 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 he 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 he have been oxidising? couldn't we have been oxidising? couldn't you have been oxidising? couldn't they have been oxidising?