Which concept explains that two sentences can share the same deep structure but have different surface structures?

Which concept explains that two sentences can share the same deep structure but have different surface structures?

• A. Surface Structure
• B. Deep Structure
• C. Pragmatic Rules
• D. Idiosyncratic Rules

Answer: (B)

The idea here is that there is an underlying representation—the deep structure—that captures the core meaning and the grammatical relations of a sentence. That deep structure can be realized in different word orders or surface forms through transformations, so two sentences can express the same relationships and meaning even though their surface structure looks different. For example, an active sentence and its passive counterpart share the same underlying roles (who did what to whom), but their surface word order changes because of the transformation from deep to surface form. That’s why the concept describing this phenomenon is the deep structure: it’s the stable, underlying representation that can yield multiple surface realizations. The other options point to what you actually hear or use in context (surface form, pragmatic use, idiosyncratic rules), which don’t explain why different surface appearances can reflect the same underlying structure.

The idea here is that there is an underlying representation—the deep structure—that captures the core meaning and the grammatical relations of a sentence. That deep structure can be realized in different word orders or surface forms through transformations, so two sentences can express the same relationships and meaning even though their surface structure looks different. For example, an active sentence and its passive counterpart share the same underlying roles (who did what to whom), but their surface word order changes because of the transformation from deep to surface form. That’s why the concept describing this phenomenon is the deep structure: it’s the stable, underlying representation that can yield multiple surface realizations. The other options point to what you actually hear or use in context (surface form, pragmatic use, idiosyncratic rules), which don’t explain why different surface appearances can reflect the same underlying structure.