English verb conjugation COULD CHANGE

Regular verb: change - changed - changed


Affirmation

Simple form

I could change
you could change
he could change
we could change
you could change
they could change

V-ing form

I could be changing
you could be changing
he could be changing
we could be changing
you could be changing
they could be changing

Perfect

I could have changed
you could have changed
he could have changed
we could have changed
you could have changed
they could have changed

V-ing perfect

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

Negation

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

could I change?
could you change?
could he change?
could we change?
could you change?
could they change?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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