English verb conjugation
COULD CENTRE

Regular verb: centre - centred - centred

Affirmation

Simple form	V-ing form
I could centre you could centre he could centre we could centre you could centre they could centre	I could be centring you could be centring he could be centring we could be centring you could be centring they could be centring
Perfect	V-ing perfect
I could have centred you could have centred he could have centred we could have centred you could have centred they could have centred	I could have been centring you could have been centring he could have been centring we could have been centring you could have been centring they could have been centring

Negation

Simple form	V-ing form
I could not centre you could not centre he could not centre we could not centre you could not centre they could not centre	I could not be centring you could not be centring he could not be centring we could not be centring you could not be centring they could not be centring
Perfect	V-ing perfect
I could not have centred you could not have centred he could not have centred we could not have centred you could not have centred they could not have centred	I could not have been centring you could not have been centring he could not have been centring we could not have been centring you could not have been centring they could not have been centring

Interrogative form

Simple form	V-ing form
could I centre? could you centre? could he centre? could we centre? could you centre? could they centre?	could I be centring? could you be centring? could he be centring? could we be centring? could you be centring? could they be centring?
Perfect	V-ing perfect
could I have centred? could you have centred? could he have centred? could we have centred? could you have centred? could they have centred?	could I have been centring? could you have been centring? could he have been centring? could we have been centring? could you have been centring? could they have been centring?

Interro-negative form

Simple form	V-ing form
could I not centre? could you not centre? could he not centre? could we not centre? could you not centre? could they not centre?	could I not be centring? could you not be centring? could he not be centring? could we not be centring? could you not be centring? could they not be centring?
Perfect	V-ing perfect
could I not have centred? could you not have centred? could he not have centred? could we not have centred? could you not have centred? could they not have centred?	could I not have been centring? could you not have been centring? could he not have been centring? could we not have been centring? could you not have been centring? could they not have been centring?