English verb conjugation COULD RESEARCH

Regular verb: research - researched - researched

Affirmation

Simple form

I could research
you could research
he could research
we could research
you could research
they could research

V-ing form

I could be researching
you could be researching
he could be researching
we could be researching
you could be researching
they could be researching

Perfect

I could have researched
you could have researched
he could have researched
we could have researched
you could have researched
they could have researched

V-ing perfect

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

Negation

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

could I research?
could you research?
could he research?
could we research?
could you research?
could they research?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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