Ming from Agents of Speech explains why language-delayed kids can't answer "How was your day?" and shows how to use photos from shared activities to help them tell you what happened. Start with pictures in order, ask small questions about each one, then gradually remove the visual supports as they learn the pattern.
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The tricky thing about how was your day? Is you don't know how their day went, so you cannot prompt them. But if you spent the day with them, then you know what happened during the day and you can prompt them. And prompting verbally will not help the kid. They need visual cues in order to recount what happened during the day. Because recounting and also constructing the language are two different demands inside of the brain. You want them to only focus on the language production of which you can prompt. So you show them the pictures that you. You did in the morning. How was your day? Let me help you see what happened first. Oh, in the morning we went to blah, blah, blah, and then the next one you swipe. In the afternoon, we went to the cinema and we watched the movie. Can you tell me a little about the movie? It was about Spider Man. After the movie, what happened next? Dad got the car and you can show him. Then we went home. That's how you prompt. So after you get that part correct, you can start taking out those cues, those pictures, and once for sure, because you went through through the day with the kid, and you're able to teach those sentences, that framework of how to recount something to.