This book contains a collection of problems on language acquisition. The first part of the book deals with first and bilingual language acquisition in a naturalistic situation. The second part presents problems on second language acquisition, both in a naturalistic and in an instructed situation. The third part of the book contains activities bases on scenes of the video Talking in a second language..The aim of the book is twofold. It tries to provide students and teachers-to-be at different language acquisition courses in our universities with authentic material from our own language acquisition context. At the same time, its examples from real data may also be of interest to researchers in the fields of language acquisition and applied linguistics as the basis for discussion and further research.