English verb conjugation COULD USE

Regular verb: use - used - used

Affirmation

Simple form

I could use
you could use
she could use
we could use
you could use
they could use

V-ing form

I could be using
you could be using
she could be using
we could be using
you could be using
they could be using

Perfect

I could have used
you could have used
she could have used
we could have used
you could have used
they could have used

V-ing perfect

I could have been using
you could have been using
she could have been using
we could have been using
you could have been using
they could have been using

Negation

Simple form

I couldn't use
you couldn't use
she couldn't use
we couldn't use
you couldn't use
they couldn't use

V-ing form

I couldn't be using
you couldn't be using
she couldn't be using
we couldn't be using
you couldn't be using
they couldn't be using

Perfect

I couldn't have used
you couldn't have used
she couldn't have used
we couldn't have used
you couldn't have used
they couldn't have used

V-ing perfect

I couldn't have been using
you couldn't have been using
she couldn't have been using
we couldn't have been using
you couldn't have been using
they couldn't have been using

Interrogative form

Simple form

could I use?
could you use?
could she use?
could we use?
could you use?
could they use?

V-ing form

could I be using?
could you be using?
could she be using?
could we be using?
could you be using?
could they be using?

Perfect

could I have used?
could you have used?
could she have used?
could we have used?
could you have used?
could they have used?

V-ing perfect

could I have been using?
could you have been using?
could she have been using?
could we have been using?
could you have been using?
could they have been using?

Interro-negative form

Simple form

couldn't I use?
couldn't you use?
couldn't she use?
couldn't we use?
couldn't you use?
couldn't they use?

V-ing form

couldn't I be using?
couldn't you be using?
couldn't she be using?
couldn't we be using?
couldn't you be using?
couldn't they be using?

Perfect

couldn't I have used?
couldn't you have used?
couldn't she have used?
couldn't we have used?
couldn't you have used?
couldn't they have used?

V-ing perfect

couldn't I have been using?
couldn't you have been using?
couldn't she have been using?
couldn't we have been using?
couldn't you have been using?
couldn't they have been using?

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