Solution:
Translate the Russian sentence 'Когда он придёт домой?' into English using the Future Simple tense.
- Identify the question word: 'Когда' (When).
- Identify the subject: 'он' (he).
- Identify the verb: 'придёт' (will come).
- Identify the destination: 'домой' (home).
- Combine these elements into a Future Simple question.
Answer: When will he come home?