What Era is called The Great Dying Era

The teacher didn't explain this at all and i don't understand this

Turn this sentence into a negative sentence using double negation: hay alguien aquí. a. nadie aquí hay b. no hay nada aquí c. nadie hay aquí d. no hay nadie aquí

You have been chosen to be the guide of an exchange student from costa rica. before the student arrives in the us, he has asked you to give him some tips about schools in our country. using 10 different commands, create a presentation in which you give him tips for being successful in us schools. your presentation should include 5 affirmative and 5 negative commands in the tú form. examples: study many hours, don’t sleep in class, etc. to create your presentation, you may use powerpoint, or one of the tools listed in the web 2.0 tools area (contact your instructor if you need ).