Background: The international science competitions show that students from different countries perform differently in subjects such as mathematics, physics and chemistry. In the literature comparative empirical studies tried to address the reasons for cross-national students' differences in performance from different perspectives such as teaching…

This textbook of English Grammar presupposes a certain amount of previous training in the theory and practice of English, and its specific place in the curriculum is to be found in the advanced grammar grades of public schools, though the book is also suited to the wants of high schools and academies. The author would state in a single sentence…