In Spain is very difficult to find anybody who could speak English more or less correctly. Granada, however, hosts one of the largest universities in Spain. With a population of above 60.000 university students, and being chosen as a permanent or transient residence by many foreigners, the "English-speaking" trouble is much softened.
In any case, we recommend you to be patient and try to communicate with the local people in the way you can. This survival guide is intended to give you some clues not to die in the attempt.