English verb conjugation COULD DIAGNOSE

Regular verb: diagnose - diagnosed - diagnosed

Affirmation

Simple form

I could diagnose
you could diagnose
he could diagnose
we could diagnose
you could diagnose
they could diagnose

V-ing form

I could be diagnosing
you could be diagnosing
he could be diagnosing
we could be diagnosing
you could be diagnosing
they could be diagnosing

Perfect

I could have diagnosed
you could have diagnosed
he could have diagnosed
we could have diagnosed
you could have diagnosed
they could have diagnosed

V-ing perfect

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

Negation

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

could I diagnose?
could you diagnose?
could he diagnose?
could we diagnose?
could you diagnose?
could they diagnose?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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