English verb conjugation COULD YIP

Regular verb: yip - yipped - yipped

Affirmation

Simple form

I could yip
you could yip
he could yip
we could yip
you could yip
they could yip

V-ing form

I could be yipping
you could be yipping
he could be yipping
we could be yipping
you could be yipping
they could be yipping

Perfect

I could have yipped
you could have yipped
he could have yipped
we could have yipped
you could have yipped
they could have yipped

V-ing perfect

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

Negation

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

could I yip?
could you yip?
could he yip?
could we yip?
could you yip?
could they yip?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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