English verb conjugation COULD UNDULATE

Regular verb: undulate - undulated - undulated

Affirmation

Simple form

I could undulate
you could undulate
he could undulate
we could undulate
you could undulate
they could undulate

V-ing form

I could be undulating
you could be undulating
he could be undulating
we could be undulating
you could be undulating
they could be undulating

Perfect

I could have undulated
you could have undulated
he 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
he could have been undulating
we could have been undulating
you could have been undulating
they could have been undulating

Negation

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

could I undulate?
could you undulate?
could he undulate?
could we undulate?
could you undulate?
could they undulate?

V-ing form

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

Perfect

could I have undulated?
could you have undulated?
could he 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 he have been undulating?
could we have been undulating?
could you have been undulating?
could they have been undulating?

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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