In the second-person dual/plural and first-person positions, the lexical root remains stable while prefixes and attached endings change.
PronounActive imperfectPassive imperfect
أَنْتُمَا (م)تَخَافَانِتُخَافَانِ
أَنْتُمْتَخَافُونَتُخَافُونَ
أَنْتِتَخَافِينَتُخَافِينَ
أَنْتُمَا (ف)تَخَافَانِتُخَافَانِ
أَنْتُنَّتَخَفْنَتُخَفْنَ
أَنَاأَخَافُأُخَافُ
نَحْنُنَخَافُنُخَافُ
تَخَافِينَ contains the second-person feminine yāʾ and an inflectional nūn. أَخَافُ is first-person singular and نَخَافُ first-person plural.