English verb conjugation COULD UNDULATE

Regular verb: undulate - undulated - undulated

Affirmation

Simple form

I could undulate
you could undulate
she could undulate
we could undulate
you could undulate
they could undulate

V-ing form

I could be undulating
you could be undulating
she could be undulating
we could be undulating
you could be undulating
they could be undulating

Perfect

I could have undulated
you could have undulated
she could have undulated
we could have undulated
you could have undulated
they could have undulated

V-ing perfect

I could have been undulating
you could have been undulating
she could have been undulating
we could have been undulating
you could have been undulating
they could have been undulating

Negation

Simple form

I could not undulate
you could not undulate
she could not undulate
we could not undulate
you could not undulate
they could not undulate

V-ing form

I could not be undulating
you could not be undulating
she could not be undulating
we could not be undulating
you could not be undulating
they could not be undulating

Perfect

I could not have undulated
you could not have undulated
she could not have undulated
we could not have undulated
you could not have undulated
they could not have undulated

V-ing perfect

I could not have been undulating
you could not have been undulating
she could not have been undulating
we could not have been undulating
you could not have been undulating
they could not have been undulating

Interrogative form

Simple form

could I undulate?
could you undulate?
could she undulate?
could we undulate?
could you undulate?
could they undulate?

V-ing form

could I be undulating?
could you be undulating?
could she be undulating?
could we be undulating?
could you be undulating?
could they be undulating?

Perfect

could I have undulated?
could you have undulated?
could she have undulated?
could we have undulated?
could you have undulated?
could they have undulated?

V-ing perfect

could I have been undulating?
could you have been undulating?
could she have been undulating?
could we have been undulating?
could you have been undulating?
could they have been undulating?

Interro-negative form

Simple form

could I not undulate?
could you not undulate?
could she not undulate?
could we not undulate?
could you not undulate?
could they not undulate?

V-ing form

could I not be undulating?
could you not be undulating?
could she not be undulating?
could we not be undulating?
could you not be undulating?
could they not be undulating?

Perfect

could I not have undulated?
could you not have undulated?
could she not have undulated?
could we not have undulated?
could you not have undulated?
could they not have undulated?

V-ing perfect

could I not have been undulating?
could you not have been undulating?
could she not have been undulating?
could we not have been undulating?
could you not have been undulating?
could they not have been undulating?

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