English verb conjugation COULD YAK

Regular verb: yak - yaked - yaked

Affirmation

Simple form

I could yak
you could yak
he could yak
we could yak
you could yak
they could yak

V-ing form

I could be yaking
you could be yaking
he could be yaking
we could be yaking
you could be yaking
they could be yaking

Perfect

I could have yaked
you could have yaked
he could have yaked
we could have yaked
you could have yaked
they could have yaked

V-ing perfect

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

Negation

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

could I yak?
could you yak?
could he yak?
could we yak?
could you yak?
could they yak?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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