The GMAT Sentence Correction part will measure your ability to elaborate sentences, both in grammar, mode and form. There will be a text that will help you give context to the sentence, and a sentence will be highlighted. This one will probably have an error. In the options, you will choose the one that can replace the statement, so that it is “correct”. In them, the original will always appear, so there are times when it is well structured. The important thing is not only to be well written, but to maintain the intention that corresponds to the text and, both the correct time and logic. This is the type of question that appears the most, with an average of 14 in total, due to the speed in which they can be answered.

For example, we take the following questions from the Official Guide for GMAT Review 2016:

1. Unlike t he buildings in Mesopotamian cities, which were arranged haphazardly, the same basic plan was followed for all cities of the Indus Valley: with houseslaid out on the north-south, east-west grid, and houses and walls were built of standard -size bricks.
   1. the buildings in Mesopotamian cities, which were arranged haphazardly, the same basic plan was followed for all cities of the Indus Valley: with houses
   2. the buildings in Mesopotamian cities, which were haphazard in arrangement, the same basic plan was used in all cities of the Indus Valley: houses were
   3. the arrangement of buildings in Mesopotamian cities, which were haphazard, the cities of the Indus Valley all followed the same basic plan: houses
   4. Mesopotamian cities, in which buildings were arranged haphazardly, the cities of the Indus Valley all followed the same basic plan: houses
   5. Mesopotamian cities, which had buildings that were arranged haphazardly, the same basic plan was used for all cities in the Indus Valley: houses that were
2. In 1923, the Supreme Court declared a minimum wage for women and children in the District of Columbia as unconstitutional, andruling that it was a form of price-fixing and, as such, an abridgment of the right of contract
   1. the Supreme Court declared a minimum wage for women and children in the District of Columbia as unconstitutional, and
   2. the Supreme Court declared as unconstitutional a minimum wage for women and children in the District of Columbia, and
   3. the Supreme Court declared unconstitutional a minimum wage for women and children in the District of Columbia,
   4. a minimum wage for women and children in the District of Columbia was declared unconstitutional by the Supreme Court,
   5. when the Supreme Court declared a minimum wage for women and children in the District of Columbia as unconstitutional
3. Critics contend that the new missile is a weapon whose importance is largely symbolic, more a tool for manipulating people’s perceptions than to fulfilla real military need
   1. for manipulating people’s perceptions than to fulfill
   2. for manipulating people’s perceptions than for fulfilling
   3. to manipulate people’s perceptions rather than that it fulfills
   4. to manipulate people’s perceptions rather than fulfilling
   5. to manipulate people’s perceptions than for fulfilling

Observe how the questions will not have vocabulary errors, but grammatical errors that are difficult to observe, but that make the sentences more appropriate for the context in which they are immersed. For this reason it is essential not only to read the underlined, but the entire text in general.