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. ->

1. He was the first man to leave the burning building.

2. The last person to leave the room must turn out the lights.

3. The child is lonely, he would be happier if he had someone to play with.

4. Here are some accounts for you to check.

5. My brother is the only that realized the danger 

$1$. He was the first man to leave the burning building.The last person to leave the room must turn out the lights

$2$. He last person to leave the room must turn out the lights

$3$. He child is lonely; he would be happier if he had someone to play with

$4$. Here are some accounts for you to check

$5$. My brother is the only one to realize the danger