Textbooks are among the main course materials in developing basic language skills in foreign language teaching. The textbooks prepared for teaching Turkish as a foreign language include activities for reading, listening, speaking, writing and grammar. Grammar teaching is an area of skill that we must emphasize in terms of communication and influencing all skills. Making grammatical errors and misuse of suffixes causes meaning changes, communication disorders and misunderstandings. Grammar learning should be completed by using different methods rather than a single method in grammar teaching. In this article, grammar expression and exercises of Istanbul book used to teach Turkish to foreigners are examined considering the importance of grammar teaching. Document analysis technique was used in examining the Turkish teaching book for foreigners named İstanbul. In the book on teaching Turkish to foreigners named Istanbul, grammar exercises examining considered and positive and negative aspects of their activities are examined. Quality is important in activities, not quantity. It should be looked at how much it teaches the subject, not the number of activities. When preparing grammar activities in the books, instead of teaching only grammar, the grammarshould be taught along with four other skills. In the same way, even if the subject of grammar will not be taught, grammar should be mentioned when trying to acquire four skills.