The detached second-person pronoun must match the ending already attached to the verb.
Past formNominal orderدَخَلْتَأَنْتَ دَخَلْتَدَخَلْتُمَاأَنْتُمَا دَخَلْتُمَادَخَلْتُمْأَنْتُمْ دَخَلْتُمْدَخَلْتِأَنْتِ دَخَلْتِدَخَلْتُمَاأَنْتُمَا دَخَلْتُمَادَخَلْتُنَّأَنْتُنَّ دَخَلْتُنَّ
The dual form is shared by masculine and feminine addressees, so the same pair appears in both slots.