Use four steps whenever you meet لَمَّا + imperfect.
1. Translate لَمَّا as “not yet.”
2. Identify the imperfect and its ending group.
3. Explain the jussive result: sukun, removal of inflectional nun, or no visible change.
4. If a connecting kasrah appears before الـ, do not mistake it for naṣb.
Common mistakes: translating لَمَّا as “never,” or treating its connecting kasrah as the verb's original ending.