YOU SAID:

Last week I almost slept with my sister's friend.

INTO JAPANESE

先週、私は妹の友達とほとんど寝ていました。

BACK INTO ENGLISH

Last week I was sleeping mostly with my sister's friend.

INTO JAPANESE

先週、私は主に妹の友人と寝ていました。

BACK INTO ENGLISH

Last week, I was mainly sleeping with my sister's friend.

INTO JAPANESE

先週、私は主に妹の友達と寝ていました。

BACK INTO ENGLISH

Last week, I was mainly sleeping with my sister's friends.

INTO JAPANESE

先週、私は主に妹の友達と寝ていました。

BACK INTO ENGLISH

Last week, I was mainly sleeping with my sister's friends.