English verb conjugation COULD UNPIN

Regular verb: unpin - unpinned - unpinned

Affirmation

Simple form

I could unpin
you could unpin
he could unpin
we could unpin
you could unpin
they could unpin

V-ing form

I could be unpinning
you could be unpinning
he could be unpinning
we could be unpinning
you could be unpinning
they could be unpinning

Perfect

I could have unpinned
you could have unpinned
he could have unpinned
we could have unpinned
you could have unpinned
they could have unpinned

V-ing perfect

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

Negation

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

could I unpin?
could you unpin?
could he unpin?
could we unpin?
could you unpin?
could they unpin?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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