English verb conjugation COULD OBSERVE

Regular verb: observe - observed - observed

Affirmation

Simple form

I could observe
you could observe
he could observe
we could observe
you could observe
they could observe

V-ing form

I could be observing
you could be observing
he could be observing
we could be observing
you could be observing
they could be observing

Perfect

I could have observed
you could have observed
he could have observed
we could have observed
you could have observed
they could have observed

V-ing perfect

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

Negation

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

could I observe?
could you observe?
could he observe?
could we observe?
could you observe?
could they observe?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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