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This thesis is an exploration of two interactional processes, syntactic completion and other-extension. The aim of the study is to explore what if anything triggers the use of these phenomena, to scrutinise their form and their interactional function and how they are received in the dialogue. The notion of the conversational turn and how the concept relates to the two phenomena is also discussed in the study. The thesis is based on an empirical study carried out in the framework of interactional linguistics which rests upon conversation analysis (CA) but also draws upon mainstream linguistics and has a linguistic viewpoint. The empirical data consist of 20 hours of everyday conversation from the ISTAL corpus of spoken Icelandic, recorded in the year 2000. Both completions and other-extensions show collaborative actions, which appear in the relaxed settings as found in the ISTAL data. The data analysed in the thesis consist of 53 examples of completions and 73 instances of other-extensions. [---]