This study deals with adult natural second language acquisition and social acculturation resulting from Chinese immigrants' coming into contact with the Spanish language and Ecuadorian culture. The objective is to examine the acquisition of Spanish morpho-syntactic features of the present verb tense and subject/verb agreement. The results indicate that the older adult participants have a greater tendency to use the third person singular form whether there is agreement or not. The conclusion is the older adult second language learners rely on their first language as a linguistic knowledge base for the use of non-conjugated forms. In so doing, they create a communication system based on first language tendencies in combination with a Spanish-based lexicon, in a process that bears many qualities of pidginization.