1. They aren't rich enough to travel around the world
-> If they were rich, they would travel around the world
2. Mrs.Mai is responsible for taking care of these elderly people
-> Looking after these elderly people is Mrs. Mai's responsibility
3. Hoa doesn't live near the school , but the always comes to school on time
-> In spite of not living near school, she always comes to school on time
4. We are studying in air-conditioned classroom
-> The classroom in which we are studying is equipped with air-conditioners
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