1. Does Koko really understand sign language? Support your position with quotes from the text. Explain your quotes clearly. Argue your point thoroughly.

Her caregiver, Francine "Penny" Patterson, reports that Koko is able to understand more than 1,000 signs of what Patterson calls "Gorilla Sign Language" (GSL).[2] In contrast to other experiments attempting to teach sign language to non-human primates, Patterson simultaneously exposed Koko to spoken English from an early age. Reports state that Koko understands approximately 2,000 words of spoken English. 

Yes. Koko understands over 1000 signs! But, koko does not pay attention to grammar.

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