English verb conjugation COULD INVESTIGATE

Regular verb: investigate - investigated - investigated

Affirmation

Simple form

I could investigate
you could investigate
he could investigate
we could investigate
you could investigate
they could investigate

V-ing form

I could be investigating
you could be investigating
he could be investigating
we could be investigating
you could be investigating
they could be investigating

Perfect

I could have investigated
you could have investigated
he could have investigated
we could have investigated
you could have investigated
they could have investigated

V-ing perfect

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

Negation

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

could I investigate?
could you investigate?
could he investigate?
could we investigate?
could you investigate?
could they investigate?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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