Suppose the intended message is that Zayd has arrived:
جَاءَ زَيْدٌ — Zayd came: an unmarked report.
إِنَّ زَيْدًا قَدْ جَاءَ — Indeed, Zayd has arrived: a more emphatic report.
Emphasis may be helpful when a listener doubts the report and less suitable when the fact is already accepted. Neither sentence is automatically wrong; suitability depends on the communicative circumstances.
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Introduction: Structure, Three Disciplines and Kinds of Preface
Suppose the intended message is that Zayd has arrived:
جَاءَ زَيْدٌ — Zayd came: an unmarked report.
إِنَّ زَيْدًا قَدْ جَاءَ — Indeed, Zayd has arrived: a more emphatic report.
Emphasis may be helpful when a listener doubts the report and less suitable when the fact is already accepted. Neither sentence is automatically wrong; suitability depends on the communicative circumstances.