English verb conjugation COULD DISCOLOUR

Regular verb: discolour - discoloured - discoloured

Affirmation

Simple form

I could discolour
you could discolour
he could discolour
we could discolour
you could discolour
they could discolour

V-ing form

I could be discolouring
you could be discolouring
he could be discolouring
we could be discolouring
you could be discolouring
they could be discolouring

Perfect

I could have discoloured
you could have discoloured
he could have discoloured
we could have discoloured
you could have discoloured
they could have discoloured

V-ing perfect

I could have been discolouring
you could have been discolouring
he could have been discolouring
we could have been discolouring
you could have been discolouring
they could have been discolouring

Negation

Simple form

I couldn't discolour
you couldn't discolour
he couldn't discolour
we couldn't discolour
you couldn't discolour
they couldn't discolour

V-ing form

I couldn't be discolouring
you couldn't be discolouring
he couldn't be discolouring
we couldn't be discolouring
you couldn't be discolouring
they couldn't be discolouring

Perfect

I couldn't have discoloured
you couldn't have discoloured
he couldn't have discoloured
we couldn't have discoloured
you couldn't have discoloured
they couldn't have discoloured

V-ing perfect

I couldn't have been discolouring
you couldn't have been discolouring
he couldn't have been discolouring
we couldn't have been discolouring
you couldn't have been discolouring
they couldn't have been discolouring

Interrogative form

Simple form

could I discolour?
could you discolour?
could he discolour?
could we discolour?
could you discolour?
could they discolour?

V-ing form

could I be discolouring?
could you be discolouring?
could he be discolouring?
could we be discolouring?
could you be discolouring?
could they be discolouring?

Perfect

could I have discoloured?
could you have discoloured?
could he have discoloured?
could we have discoloured?
could you have discoloured?
could they have discoloured?

V-ing perfect

could I have been discolouring?
could you have been discolouring?
could he have been discolouring?
could we have been discolouring?
could you have been discolouring?
could they have been discolouring?

Interro-negative form

Simple form

couldn't I discolour?
couldn't you discolour?
couldn't he discolour?
couldn't we discolour?
couldn't you discolour?
couldn't they discolour?

V-ing form

couldn't I be discolouring?
couldn't you be discolouring?
couldn't he be discolouring?
couldn't we be discolouring?
couldn't you be discolouring?
couldn't they be discolouring?

Perfect

couldn't I have discoloured?
couldn't you have discoloured?
couldn't he have discoloured?
couldn't we have discoloured?
couldn't you have discoloured?
couldn't they have discoloured?

V-ing perfect

couldn't I have been discolouring?
couldn't you have been discolouring?
couldn't he have been discolouring?
couldn't we have been discolouring?
couldn't you have been discolouring?
couldn't they have been discolouring?

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