Ana: Hi, Sara!
Sara: Hi Ana!
Ana: What are you doing?
Sara: I`m doing my homework.
Ana: You look terrible! What happened to you?
Sara: I don't feel well. I have a terrible headache, besides I`m a little bit worried because I have a lot of homework.
Ana: You should take an aspirin. Tell me, what's your homework about?
Sara: I have to do a research about global warming.
Ana: Oh! what a coincidence! I'm doing a research about global warming, too. If you want, we can do it together.
Sara: Of course. Thank you very much.
Ana: It`s my pleasure