把下列句子改为含有定语从句的主从复合句。
1. I know the boy. He can speak English well.
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2. The season is summer. It comes after spring.
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3. The building is my uncle's house. Its wall is white.
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4. Will you please lend me the very book? You bought a book last Sunday.
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5. The student is our monitor. Our headmaster praised him at the school meeting.
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