didn't

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One day, while I was walking home from school, I saw a little girl crying by the side of the road. She was lost and didn't know how to get back to her parents. I decided to help her.

句子1： Because he was ill, he didn't come to school today. But luckily, his classmates helped him with his studies.在这个句子中，主句描述了“他今天没来上学”的事实，从句用“Because”连接，解释了为什么他没来上学的原因——“因为他生病了”。