1. فالعَطْفُ لم يَأْتِ في إضْمارِ تابِعِهِ

    ولا يُخالِفُ مَتْبُوعاً لَهَا ذُكِرا

    So explanatory apposition does not occur with a pronominal dependent.

    Nor does it differ from the word mentioned as its head.

  2. ولم تَكُنْ جُمْلَةٌ أَيْضاً وتابِعُها

    والفِعْلُ كَلاَ وَلاَ الْمَجْهولُ مِنْ أُخْرَى

    Nor is it a clause either, or a dependent of one.

    And a verb—no; nor the unknown from another [clause].

  3. وَلا تَحُلُّ مَحَلَّ الأَصْلِ قَطُّ وَلاَ

    تَأْتِي بِلَفْظٍ لِمَتْبُوعٍ لَهُ زُبِرا

    And it never occupies the original word’s place, nor

    does it come in wording written for the word it follows.

  4. وَعَكْسُها صَحّ في الإبْدالِ مُطَّرِداً

    خُذْها ثَمانِيةً تَسْتَيْسِرُ العَسِرَا

    And the reverse of these holds consistently in substitution.

    Take these eight, and you will find the difficult easy.