What caution is needed when parsing ḍabḥan, qadḥan and ṣubḥan?

Supplementary Practice 25 — Comparative Rhetoric of Sūrat az-Zalzalah and Sūrat al-ʿĀdiyāt

• Call all three adverbs of place without checking context
• Treat all three as predicates of inna
• Examine their different syntactic relations despite similar endings
• Assume every accusative is a direct object