English verb conjugation CAN OBSERVE

Regular verb: observe - observed - observed

Affirmation

Simple form

I can observe
you can observe
he can observe
we can observe
you can observe
they can observe

V-ing form

I can be observing
you can be observing
he can be observing
we can be observing
you can be observing
they can be observing

Perfect

I can have observed
you can have observed
he can have observed
we can have observed
you can have observed
they can have observed

V-ing perfect

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

Negation

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

can I observe?
can you observe?
can he observe?
can we observe?
can you observe?
can they observe?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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