A past-tense form can already contain its subject as a pronoun. To make the nominal order explicit, place the matching detached pronoun first.
دَخَلَ ← هُوَ دَخَلَ
دَخَلْتُ ← أَنَا دَخَلْتُ
دَخَلْنَا ← نَحْنُ دَخَلْنَا
The detached pronoun becomes the mubtada. The past verb keeps the form that already identifies the same person, number and gender. Do not replace دَخَلْتُ with a third-person form after adding أَنَا.
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Changing a Verbal Sentence into a Nominal Sentence
A past-tense form can already contain its subject as a pronoun. To make the nominal order explicit, place the matching detached pronoun first.
دَخَلَ ← هُوَ دَخَلَ
دَخَلْتُ ← أَنَا دَخَلْتُ
دَخَلْنَا ← نَحْنُ دَخَلْنَا
The detached pronoun becomes the mubtada. The past verb keeps the form that already identifies the same person, number and gender. Do not replace دَخَلْتُ with a third-person form after adding أَنَا.