You haven't explained your assignment sufficiently, but in both cases, the two sentence can be simply combined into a single sentence: The whole family will stay up talking until the clock strikes midnight. They will all go to bed when they feel very tired.
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farassoo It says: Combine these sentences. Use the simple present and future forms (will/be going to).That's precisely what I have done above, I think.
farassooI need to start the second sentence with 'By the time'. Is this correct?By the time they go to bed, they will feel very tired.Yes, that is OK.
Mister Micawber That's precisely what I have done above, I thinkNo. I meant they were individual sentences and there was no explanation in my book. I didn't mean your answers..