Abstract
In the study conducted using qualitative research methods, one of the purposeful samplings, typical case sampling was used. The date were collected from two sources. The students were asked to prepare any topic they wanted and then delivered it. The students were observed for one month in order to detect their mistakes as they speak, through participant observation. Expression mistakes were classified and interpreted before they made them. Mistakes in one sentence considered for more than one category were classified under all categories. In addition, both in data collection and analysis, validity and reliability measures were taken. At the end of the research, we found that Turkic students made errors more in sentence components followed by compounds errors, errors originating from the use of plural morpheme, temporal-personal morphemes. We also observed that Turkic students made minimum errors in voice, conjunctions-prepositions and verbs. Key words: Teaching Turkish, Turkic students , Kazakh, speaking skills, misuse, expressions.  
Highlights
Speaking is one of the most commonly used skills to transmit emotions, thoughts and expectations, it is still the most troublesome language skill
At the end of the research, we found that Turkic students made errors more in sentence components followed by compounds errors, errors originating from the use of plural morpheme, temporal-personal morphemes
A case study is an empirical research method where an up-to-date event is examined within its real life frame and in which no certain limit is defined between the event and the content and which is used in situations where more than one data source or clue are reported (Yin, 1984). Since such an actual topic as the expression mistakes committed by Turkic students learning Turkish has been studied in real life frame and based on more than one data source, case study design was used
Summary
Speaking is one of the most commonly used skills to transmit emotions, thoughts and expectations, it is still the most troublesome language skill. Considering that even the students born and raised up in Turkey have difficulty in speaking Turkish and communicating their thoughts to others, it would be even more challenging for them to learn Turkish and master speaking skills in a different geographical area within a different culture (Özyürek, 2009). As a result, those living outside Turkey make more errors speaking Turkish and construct more complicated expressions. As a rule, speaking is defined as a way of communicating feelings, thoughts, dreams of individuals to others; it is one of the ineluctable skills used to satisfy a need, share solitude, change prejudices, communicate knowledge and thoughts to others, advise and persuade people, share moral and ethical values, inform people about scientific researches, entertain oneself or spend nice time with others and so on (Gündüz and Şimşek, 2014)
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