- The guests enjoyed the party happily last night.
- Last night enjoyed the guests the party happily.
- Happily enjoyed the guests the party last night.
- The guests enjoyed happily the party last night.
The correct sentence structure in English is Time-Subject-Adverb-Verb-Object. The time (last night) should come first, followed by the subject (the guests), the adverb (happily), the verb (enjoyed), and finally, the object (the party). The correct option (a) follows this structure.
