English verb conjugation COULD SIGHTSEE

Regular verb: sightsee - sightseed - sightseed

Affirmation

Simple form

I could sightsee
you could sightsee
he could sightsee
we could sightsee
you could sightsee
they could sightsee

V-ing form

I could be sightseeing
you could be sightseeing
he could be sightseeing
we could be sightseeing
you could be sightseeing
they could be sightseeing

Perfect

I could have sightseed
you could have sightseed
he could have sightseed
we could have sightseed
you could have sightseed
they could have sightseed

V-ing perfect

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

Negation

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

could I sightsee?
could you sightsee?
could he sightsee?
could we sightsee?
could you sightsee?
could they sightsee?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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