The book focuses on one aspect of foreign language acquisition that has not received much attention, that of the effect of bilingualism in the oral production of the English language learners. Two research areas have tackled this issue separately. On the one hand, third language acquisition researchers have analysed bilingualism effects in the acquisition of a third language. On the other hand, studies in interlanguage pragmatics have taken into account variables affecting the use of request acts by second language learners of English. The two research areas are considered in this volume, as it deals with bilingualism effects in the pragmatic production and awareness of third language learners of English.