The current research aims to know: "The impact of the Who am I strategy in acquiring grammatical concepts to the fifth primary grade students".The researchers followed the experimental method, being the appropriate method for the nature and purpose of her research, and chose one of the partially controlled designs, which is the design of the non-randomized control group, chose the post-test design only.The researchers identified the research community as the current research community with female students from primary day schools for girls in the center of Babylon Governorate for the academic year (2021-2022 AD); The researchers chose a sample of their research by the simple random method, which consisted of (60) female students in (Ariha Primary School for Girls), which is affiliated with the Babylon Education Directorate / Kutha District. They were randomly distributed to two groups (control and experimental), with (30) female students in the experimental group and (30) female students in the control group.One of the researchers studied the same two research groups, which started on Tuesday 16/11/2021, with two sessions per week for each group. The experiment lasted for 9 weeks, ending on Wednesday 12/1/2022.And to measure the acquisition of grammatical concepts for the fifth-grade female students (the research sample), the two researchers prepared a test to measure the acquisition of grammatical concepts consisting of (18) items distributed on objective questions, it was applied to the experimental and control groups at the end of the experiment, and the test was characterized by honesty, reliability and objectivity.The researchers dealt with the research data and results by using the statistical bag (spss) and by using the following equations: the test (t-test for two independent samples), (chi-square), (difficulty coefficient), (discrimination coefficient), (effectiveness of alternatives) and (Kueder-Richardson equation (20).