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 couldn't stumble
you couldn't stumble
he couldn't stumble
we couldn't stumble
you couldn't stumble
they couldn't stumble

V-ing form

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

Perfect

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

V-ing perfect

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

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

V-ing form

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

Perfect

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

V-ing perfect

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

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