- The students happily passed the test yesterday.
- Yesterday passed the students happily the test.
- The test passed yesterday the students happily.
- Happily passed the students the test yesterday.
The correct sentence structure in English is Time-Subject-Adverb-Verb-Object. The time (yesterday) should come first, followed by the subject (the students), the adverb (happily), the verb (passed), and finally, the object (the test). The correct option (a) follows this structure.
