He was the first man who left the burning building

Relative clauses replaced by participles and To-inf:
1. He was the first man who left the burning building.
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2. The couple who live in the next door are both doctors.
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3.the people who are waiting for the bus in the rain are getting wet.
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4. The students who didn't come to class yesterday explained their absence to the teacher.
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5. Did you get the message which concerned the special meeting?
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Relative clauses replaced by participles and to-inf:
1. Lan is the second student who enters the classroom.
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2. The psychologists who study the nature of sleep have made important discoveries.
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3. He was the only man who reached the top of the mountain.
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