Lam: first-person singular and plural

Negating the Imperfect with Lan and Lam: Subjunctive, Jussive and Full Paradigms

Lam: active | passive
First-person singular — لَمْ أَفْعَلْ | لَمْ أُفْعَلْ
First-person plural — لَمْ نَفْعَلْ | لَمْ نُفْعَلْ
First-person singular has the initial أ, and first-person plural has ن. After lam, both take final sukūn.

Word / formMeaning / explanation
لَمْ أَفْعَلْI did not do.
لَمْ نَفْعَلْwe did not do.
لَمْ أُفْعَلْit was not done to me.
لَمْ نُفْعَلْit was not done to us.

The prefix and its vowel distinguish person and active/passive voice.