1) I can use language to express prohib. ...I mustn´t or I can´t 2) I can use language to express oblig, or lack of necessity 3) I can ask for, give or refuse permission in the present or future 4) Ask permission to borrow something from a friend 5) Explain: water shortage and vector-borne diseases 6) What do you have to do in order to be healthier 7) Situation: I´m in SP. I´ll go to Rio to be in a meeting in 2 hours but My flight is delayed. 8) We have 3 vocabularies. Explain 2: wetlands - desalination or oil spill

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