Step 1: Concept
Passive Voice for Present Continuous Tense: [Object + is/am/are + being + V3 + by + Subject].
Step 2: Analysis
- Subject: The teacher
- Verb: is teaching (Present Continuous)
- Object: the students
Step 3: Transformation
"The students" (Plural) takes "are." Continuous form adds "being." Past participle of teach is "taught."
Step 4: Conclusion
"The students are being taught by the teacher" is correct.
Final Answer: (1)