English verb conjugation COULD UPGRADE

Regular verb: upgrade - upgraded - upgraded

Affirmation

Simple form

I could upgrade
you could upgrade
he could upgrade
we could upgrade
you could upgrade
they could upgrade

V-ing form

I could be upgrading
you could be upgrading
he could be upgrading
we could be upgrading
you could be upgrading
they could be upgrading

Perfect

I could have upgraded
you could have upgraded
he could have upgraded
we could have upgraded
you could have upgraded
they could have upgraded

V-ing perfect

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

Negation

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

could I upgrade?
could you upgrade?
could he upgrade?
could we upgrade?
could you upgrade?
could they upgrade?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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