English verb conjugation
COULD DECOLOURISE

Regular verb: decolourise - decolourised - decolourised

Affirmation

Simple form	V-ing form
I could decolourise you could decolourise he could decolourise we could decolourise you could decolourise they could decolourise	I could be decolourising you could be decolourising he could be decolourising we could be decolourising you could be decolourising they could be decolourising
Perfect	V-ing perfect
I could have decolourised you could have decolourised he could have decolourised we could have decolourised you could have decolourised they could have decolourised	I could have been decolourising you could have been decolourising he could have been decolourising we could have been decolourising you could have been decolourising they could have been decolourising

Negation

Simple form	V-ing form
I could not decolourise you could not decolourise he could not decolourise we could not decolourise you could not decolourise they could not decolourise	I could not be decolourising you could not be decolourising he could not be decolourising we could not be decolourising you could not be decolourising they could not be decolourising
Perfect	V-ing perfect
I could not have decolourised you could not have decolourised he could not have decolourised we could not have decolourised you could not have decolourised they could not have decolourised	I could not have been decolourising you could not have been decolourising he could not have been decolourising we could not have been decolourising you could not have been decolourising they could not have been decolourising

Interrogative form

Simple form	V-ing form
could I decolourise? could you decolourise? could he decolourise? could we decolourise? could you decolourise? could they decolourise?	could I be decolourising? could you be decolourising? could he be decolourising? could we be decolourising? could you be decolourising? could they be decolourising?
Perfect	V-ing perfect
could I have decolourised? could you have decolourised? could he have decolourised? could we have decolourised? could you have decolourised? could they have decolourised?	could I have been decolourising? could you have been decolourising? could he have been decolourising? could we have been decolourising? could you have been decolourising? could they have been decolourising?

Interro-negative form

Simple form	V-ing form
could I not decolourise? could you not decolourise? could he not decolourise? could we not decolourise? could you not decolourise? could they not decolourise?	could I not be decolourising? could you not be decolourising? could he not be decolourising? could we not be decolourising? could you not be decolourising? could they not be decolourising?
Perfect	V-ing perfect
could I not have decolourised? could you not have decolourised? could he not have decolourised? could we not have decolourised? could you not have decolourised? could they not have decolourised?	could I not have been decolourising? could you not have been decolourising? could he not have been decolourising? could we not have been decolourising? could you not have been decolourising? could they not have been decolourising?