English verb conjugation COULD STUMBLE

Regular verb: stumble - stumbled - stumbled

Affirmation

Simple form

I could stumble
you could stumble
he could stumble
we could stumble
you could stumble
they could stumble

V-ing form

I could be stumbling
you could be stumbling
he could be stumbling
we could be stumbling
you could be stumbling
they could be stumbling

Perfect

I could have stumbled
you could have stumbled
he could have stumbled
we could have stumbled
you could have stumbled
they could have stumbled

V-ing perfect

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

Negation

Simple form

I could not stumble
you could not stumble
he could not stumble
we could not stumble
you could not stumble
they could not stumble

V-ing form

I could not be stumbling
you could not be stumbling
he could not be stumbling
we could not be stumbling
you could not be stumbling
they could not be stumbling

Perfect

I could not have stumbled
you could not have stumbled
he could not have stumbled
we could not have stumbled
you could not have stumbled
they could not have stumbled

V-ing perfect

I could not have been stumbling
you could not have been stumbling
he could not have been stumbling
we could not have been stumbling
you could not have been stumbling
they could not have been stumbling

Interrogative form

Simple form

could I stumble?
could you stumble?
could he stumble?
could we stumble?
could you stumble?
could they stumble?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

could I not stumble?
could you not stumble?
could he not stumble?
could we not stumble?
could you not stumble?
could they not stumble?

V-ing form

could I not be stumbling?
could you not be stumbling?
could he not be stumbling?
could we not be stumbling?
could you not be stumbling?
could they not be stumbling?

Perfect

could I not have stumbled?
could you not have stumbled?
could he not have stumbled?
could we not have stumbled?
could you not have stumbled?
could they not have stumbled?

V-ing perfect

could I not have been stumbling?
could you not have been stumbling?
could he not have been stumbling?
could we not have been stumbling?
could you not have been stumbling?
could they not have been stumbling?

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