Arabic uses two speaker forms here: one for a single speaker and one for speakers as a group.
دَخَلْتُ means “I entered.” Put أَنَا first: أَنَا دَخَلْتُ.
دَخَلْنَا means “we entered.” Put نَحْنُ first: نَحْنُ دَخَلْنَا.
The ending تُ points to the single speaker, while نَا points to the speakers as a group. The added detached pronoun states the same person explicitly.
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Changing a Verbal Sentence into a Nominal Sentence
Arabic uses two speaker forms here: one for a single speaker and one for speakers as a group.
دَخَلْتُ means “I entered.” Put أَنَا first: أَنَا دَخَلْتُ.
دَخَلْنَا means “we entered.” Put نَحْنُ first: نَحْنُ دَخَلْنَا.
The ending تُ points to the single speaker, while نَا points to the speakers as a group. The added detached pronoun states the same person explicitly.