English verb conjugation COULD BUBBLE

Regular verb: bubble - bubbled - bubbled

Affirmation

Simple form

I could bubble
you could bubble
he could bubble
we could bubble
you could bubble
they could bubble

V-ing form

I could be bubbling
you could be bubbling
he could be bubbling
we could be bubbling
you could be bubbling
they could be bubbling

Perfect

I could have bubbled
you could have bubbled
he could have bubbled
we could have bubbled
you could have bubbled
they could have bubbled

V-ing perfect

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

Negation

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

could I bubble?
could you bubble?
could he bubble?
could we bubble?
could you bubble?
could they bubble?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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