English verb conjugation COULD YAWN

Regular verb: yawn - yawned - yawned

Affirmation

Simple form

I could yawn
you could yawn
he could yawn
we could yawn
you could yawn
they could yawn

V-ing form

I could be yawning
you could be yawning
he could be yawning
we could be yawning
you could be yawning
they could be yawning

Perfect

I could have yawned
you could have yawned
he could have yawned
we could have yawned
you could have yawned
they could have yawned

V-ing perfect

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

Negation

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

could I yawn?
could you yawn?
could he yawn?
could we yawn?
could you yawn?
could they yawn?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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