Common Errors in GMAT sentence correction
4.1 Subject verb disagreement
In a given sentence the subject and verb should agree in number.
Incorrect: When temperature increases, the ice caps melt and presumably, causes flood in summer.
Correct: When temperature increases, the ice caps melt and presumably, cause flood in summer.
Both melt and causes are verbs of the subject ice caps but causes a singular verb doesn’t agree with the plural noun ice caps.
In writing, parallelism means ‘similar, having close resemblance’. When two or more ideas in a sentence are alike in purpose, they should be expressed in the same grammatical form.
Parallel structure of a sentence means balancing
(1) a word with a word
(2) balancing of a phrase with a phrase
(3) balancing a clause with a clause
(4) balancing a sentence with a sentence
(5) balancing a noun with a noun, verb with a verb
Incorrect: Nick is young, clever and has talent.
Correct: Nick is young, clever and talented.
Incorrect: Nick likes reading and to write.
Correct: Nick likes reading and writing.
4.3 Idiomatic constructions
Every language has a set of idioms. Idioms convey appropriate meaning.
Incorrect: Some of’ the biographers of Leonardo have actually expressed regret that such a man, endowed by divine artistic genius would waste precious years of his life on such a lowly pursuit like engineering.
Correct: Some of the biographers of Leonardo have actually expressed regret that such a man, endowed with divine artistic genius would waste precious years of his life on such a lowly pursuit as engineering.