English verb conjugation
COULD CRYSTALLISE

Regular verb: crystallise - crystallised - crystallised

Affirmation

Simple form	V-ing form
I could crystallise you could crystallise he could crystallise we could crystallise you could crystallise they could crystallise	I could be crystallising you could be crystallising he could be crystallising we could be crystallising you could be crystallising they could be crystallising
Perfect	V-ing perfect
I could have crystallised you could have crystallised he could have crystallised we could have crystallised you could have crystallised they could have crystallised	I could have been crystallising you could have been crystallising he could have been crystallising we could have been crystallising you could have been crystallising they could have been crystallising

Negation

Simple form	V-ing form
I could not crystallise you could not crystallise he could not crystallise we could not crystallise you could not crystallise they could not crystallise	I could not be crystallising you could not be crystallising he could not be crystallising we could not be crystallising you could not be crystallising they could not be crystallising
Perfect	V-ing perfect
I could not have crystallised you could not have crystallised he could not have crystallised we could not have crystallised you could not have crystallised they could not have crystallised	I could not have been crystallising you could not have been crystallising he could not have been crystallising we could not have been crystallising you could not have been crystallising they could not have been crystallising

Interrogative form

Simple form	V-ing form
could I crystallise? could you crystallise? could he crystallise? could we crystallise? could you crystallise? could they crystallise?	could I be crystallising? could you be crystallising? could he be crystallising? could we be crystallising? could you be crystallising? could they be crystallising?
Perfect	V-ing perfect
could I have crystallised? could you have crystallised? could he have crystallised? could we have crystallised? could you have crystallised? could they have crystallised?	could I have been crystallising? could you have been crystallising? could he have been crystallising? could we have been crystallising? could you have been crystallising? could they have been crystallising?

Interro-negative form

Simple form	V-ing form
could I not crystallise? could you not crystallise? could he not crystallise? could we not crystallise? could you not crystallise? could they not crystallise?	could I not be crystallising? could you not be crystallising? could he not be crystallising? could we not be crystallising? could you not be crystallising? could they not be crystallising?
Perfect	V-ing perfect
could I not have crystallised? could you not have crystallised? could he not have crystallised? could we not have crystallised? could you not have crystallised? could they not have crystallised?	could I not have been crystallising? could you not have been crystallising? could he not have been crystallising? could we not have been crystallising? could you not have been crystallising? could they not have been crystallising?