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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1. I know the boy who can speak English well.
2. The season which/that comes after spring is summer.
3. The building whose wall is white is my uncle's house.
4. Will you please lend me the very book (that) you bought last Sunday?
5. The student (whom/who) our headmaster praised at the school meeting is our monitor.