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 could not hydrogenise you could not hydrogenise he could not hydrogenise we could not hydrogenise you could not hydrogenise they could not hydrogenise	I could not be hydrogenising you could not be hydrogenising he could not be hydrogenising we could not be hydrogenising you could not be hydrogenising they could not be hydrogenising
Perfect	V-ing perfect
I could not have hydrogenised you could not have hydrogenised he could not have hydrogenised we could not have hydrogenised you could not have hydrogenised they could not have hydrogenised	I could not have been hydrogenising you could not have been hydrogenising he could not have been hydrogenising we could not have been hydrogenising you could not have been hydrogenising they could not 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
could I not hydrogenise? could you not hydrogenise? could he not hydrogenise? could we not hydrogenise? could you not hydrogenise? could they not hydrogenise?	could I not be hydrogenising? could you not be hydrogenising? could he not be hydrogenising? could we not be hydrogenising? could you not be hydrogenising? could they not be hydrogenising?
Perfect	V-ing perfect
could I not have hydrogenised? could you not have hydrogenised? could he not have hydrogenised? could we not have hydrogenised? could you not have hydrogenised? could they not have hydrogenised?	could I not have been hydrogenising? could you not have been hydrogenising? could he not have been hydrogenising? could we not have been hydrogenising? could you not have been hydrogenising? could they not have been hydrogenising?