English verb conjugation
COULD HYDROGENISE

Regular verb: hydrogenise - hydrogenised - hydrogenised

Affirmation

Simple form	V-ing form
I could hydrogenise you could hydrogenise he could hydrogenise we could hydrogenise you could hydrogenise they could hydrogenise	I could be hydrogenising you could be hydrogenising he could be hydrogenising we could be hydrogenising you could be hydrogenising they could be hydrogenising
Perfect	V-ing perfect
I could have hydrogenised you could have hydrogenised he could have hydrogenised we could have hydrogenised you could have hydrogenised they could have hydrogenised	I could have been hydrogenising you could have been hydrogenising he could have been hydrogenising we could have been hydrogenising you could have been hydrogenising they could have been hydrogenising

Negation

Simple form	V-ing form
I couldn't hydrogenise you couldn't hydrogenise he couldn't hydrogenise we couldn't hydrogenise you couldn't hydrogenise they couldn't hydrogenise	I couldn't be hydrogenising you couldn't be hydrogenising he couldn't be hydrogenising we couldn't be hydrogenising you couldn't be hydrogenising they couldn't be hydrogenising
Perfect	V-ing perfect
I couldn't have hydrogenised you couldn't have hydrogenised he couldn't have hydrogenised we couldn't have hydrogenised you couldn't have hydrogenised they couldn't have hydrogenised	I couldn't have been hydrogenising you couldn't have been hydrogenising he couldn't have been hydrogenising we couldn't have been hydrogenising you couldn't have been hydrogenising they couldn't have been hydrogenising

Interrogative form

Simple form	V-ing form
could I hydrogenise? could you hydrogenise? could he hydrogenise? could we hydrogenise? could you hydrogenise? could they hydrogenise?	could I be hydrogenising? could you be hydrogenising? could he be hydrogenising? could we be hydrogenising? could you be hydrogenising? could they be hydrogenising?
Perfect	V-ing perfect
could I have hydrogenised? could you have hydrogenised? could he have hydrogenised? could we have hydrogenised? could you have hydrogenised? could they have hydrogenised?	could I have been hydrogenising? could you have been hydrogenising? could he have been hydrogenising? could we have been hydrogenising? could you have been hydrogenising? could they have been hydrogenising?

Interro-negative form

Simple form	V-ing form
couldn't I hydrogenise? couldn't you hydrogenise? couldn't he hydrogenise? couldn't we hydrogenise? couldn't you hydrogenise? couldn't they hydrogenise?	couldn't I be hydrogenising? couldn't you be hydrogenising? couldn't he be hydrogenising? couldn't we be hydrogenising? couldn't you be hydrogenising? couldn't they be hydrogenising?
Perfect	V-ing perfect
couldn't I have hydrogenised? couldn't you have hydrogenised? couldn't he have hydrogenised? couldn't we have hydrogenised? couldn't you have hydrogenised? couldn't they have hydrogenised?	couldn't I have been hydrogenising? couldn't you have been hydrogenising? couldn't he have been hydrogenising? couldn't we have been hydrogenising? couldn't you have been hydrogenising? couldn't they have been hydrogenising?