Final answer:
The difference between first and second-generation speech in multilingual communities is the development from a simplified pidgin to a more complex creole language.
Step-by-step explanation:
The main difference between the speech of the first generation and the speech of the second generation in a community where people speak different languages is the development from a pidgin to a creole. A pidgin arises when speakers of different languages need to communicate for practical purposes, like trade or work, but it's a simplified language with a limited vocabulary and grammar. Creole languages develop in the next generation when children of pidgin speakers use the pidgin as a primary language, naturally expanding and refining its structure to express a full range of meanings and abstract concepts. This shows a progression from a functional but limited form of communication to a rich, full-fledged language.