Use the same method every time.
1. Confirm that the particle is one of لَنْ، أَنْ، كَيْ، إِذَنْ، حَتَّى، لِـ.
2. Identify the imperfect form as first, second or third group.
3. Apply the correct ending rule: fatḥah, remove the inflectional nūn, or no visible change.
4. With لَنْ, translate the result as a strong negation in the future.
Common error: removing the feminine-plural nūn in يَفْعَلْنَ. That nūn is not the second-group inflectional nūn.
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Use the same method every time.
1. Confirm that the particle is one of لَنْ، أَنْ، كَيْ، إِذَنْ، حَتَّى، لِـ.
2. Identify the imperfect form as first, second or third group.
3. Apply the correct ending rule: fatḥah, remove the inflectional nūn, or no visible change.
4. With لَنْ, translate the result as a strong negation in the future.
Common error: removing the feminine-plural nūn in يَفْعَلْنَ. That nūn is not the second-group inflectional nūn.