The GMAT sentence correction section is about your ability to recognize the various elements of a GMAT sentence, elements such as 'dependent' and 'independenet clauses', qualifiers, subject and verb in the various clauses, and to make sure that the elements are logically, correctly, concisely, effectively, and correctly used to express an idea or a thought.

Among popular non-fiction titles for adults adapted for younger audiences, this picture book based on Truss' 2004 best-seller about punctuation may be a surprise, considering most kids' indifference to the topic. Yet it proves very effective, thanks to entertaining repackaging that narrows the original's broad purview to the comma, and focuses on cartoonist Timmons' interpretations of humorous comma-related goofs akin to the one referenced by the title (the punchline of an old joke about a panda, here set in a library rather than a bar). While dissolving into giggles over the change in meaning between "Eat here, and get gas," or "Eat here and get gas" (likely to be the most popular of the 14 sentence pairs given), children will find themselves gaining an instinctive understanding of the "traffic signals of language," even without the concluding spread explaining the whys and wherefores.

Syntactic Carpentry: An Emergentist Approach to Syntax
Syntactic Carpentry: An Emergentist Approach to Syntax presents a groundbreaking approach to the study of sentence formation. Building on the emergentist thesis that the structure and use of language is shaped by more basic, non-linguistic forces—rather than by an innate Universal Grammar—William O'Grady shows how the defining properties of various core syntactic phenomena (phrase structure, co-reference, control, agreement, contraction, and extraction) follow from the operation of a linear, efficiency-driven processor. This in turn leads to a compelling new view of sentence formation that subsumes syntactic theory into the theory of sentence processing, eliminating grammar in the traditional sense from the study of the language faculty.
With this text, O'Grady advances a growing body of literature on emergentist approaches to language, and situates this work in a broader picture that also includes attention to key issues in the study of language acquisition, psycholinguistics, and agrammaticism.
This book constitutes essential reading for anyone interested in syntax and its place in the larger enterprise of cognitive science.
The primary objective of this book is to advance the emergentist thesis by applying it to a difficult and important set of problems that arise in the syntax of natural language. The particular idea that I explore is that the defining properties of many important syntactic phenomena arise from the operation of a general efficiency-driven processor rather than from autonomous grammatical principles. As I will try to explain in much more detail in the pages that follow, this sort of approach points toward a possible reduction of the theory of sentence structure to the theory of sentence processing.