Replace the relative clauses by an infinitive or infinitive phrase.
1. He was the first man who left the burning building.
->
2. The last person who leaves the room must turn out the lights.
->
3. The child is lonely; he would be happier if he had someone that he could play with.
->
4. Here are some accounts that you must check.
->
5. My brother is the only one who realized the danger.
->
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