Traduire des phrases contenant des articles indéfinis en anglais Traduction

Quelle est la traduction anglaise de chacune des phrases suivantes ?

J'ai un éléphant.

I have got a elephant.

I have got elephants.

I have got the elephant.

I have got an elephant.

J'ai mal à la tête.

I have got headache.

I have got a headache.

I have got an headache.

I have got the headache.

Il y a une lettre pour toi.

There is the letter for you.

There is an letter for you.

There is a letter for you.

There is letter for you.

Je vous souhaite un joyeux Noël !

I wish you merry Christmas!

I wish you the merry Christmas!

I wish you an merry Christmas!

I wish you a merry Christmas!

Puis-je avoir une part de tarte ?

Can I have the slice of pie?

Can I have this slice of pie?

Can I have a slice of pie?

Can I have a slice of the pie?