English verb conjugation COULD CRUMBLE

Regular verb: crumble - crumbled - crumbled

Affirmation

Simple form

I could crumble
you could crumble
he could crumble
we could crumble
you could crumble
they could crumble

V-ing form

I could be crumbling
you could be crumbling
he could be crumbling
we could be crumbling
you could be crumbling
they could be crumbling

Perfect

I could have crumbled
you could have crumbled
he could have crumbled
we could have crumbled
you could have crumbled
they could have crumbled

V-ing perfect

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

Negation

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

could I crumble?
could you crumble?
could he crumble?
could we crumble?
could you crumble?
could they crumble?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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