YOU SAID:

My friends are staying at my house tonight. We are having a pizza party

INTO JAPANESE

友達は今夜私の家に泊まります。私たちはピザパーティーをしています

BACK INTO ENGLISH

My friend is staying at my house tonight. We're having a pizza party.

INTO JAPANESE

友人は今夜私の家に泊まります。私たちはピザパーティーをしています。

BACK INTO ENGLISH

My friend is staying at my house tonight. We're having a pizza party.