YOU SAID:

We could go to her party

INTO JAPANESE

私たちは彼女のパーティーに行くことができました

BACK INTO ENGLISH

We were able to go to her party

INTO JAPANESE

彼女のパーティーに行くことができました

BACK INTO ENGLISH

I was able to go to her party

INTO JAPANESE

私は彼女のパーティーに行くことができました

BACK INTO ENGLISH

I was able to go to her party