No agent for a gerund or an infinitive.
Awkward expression.
Broad pronoun reference (use of a pronoun to refer to a whole clause or sentence).
An expression that has long been overused.
Colloquialism: a word or expression appropriate to conversation, but not to formal writing.
Contraction: Avoid using contraction (for example, “didn’t”) in formal prose.
Use of the specialized slang language of a discipline.
Misplaced modifier: often a present participle or gerund (both in -ing form) modifying nothing.
Passive construction.
Incorrect use of punctuation.
Pronoun referring to no preceding noun.
Repetition, or redundancy.
Shift in number.
Split infinitive, for example, the infinitive “to go” written as “to [something] go.”
Spelling mistake.
Subject and verb disagree.
Needless shift from present tense to past, or vice versa.
Word choice: selection of an inappropriate word for the context.
Wordiness.
Too many simple sentences, each marked “S”.
Faulty parallelism: a balanced construction that remains unbalanced.
Fused sentence: two independent sentences run together.
Sentence fragment.
Non Sequitur is Latin for “it does not follow,” meaning a discontinuity in reasoning coherence, illogical statement or transitions between paragraphs.
Titles of short poems and stories go in quotation marks; only the titles of published books should be underlined or italicized.
An introduction should be a fully developed paragraph of at least four sentences. It should state a thesis and contain reference to the topics that you will be discussing in the body of the essay.
Topic sentence (at the beginning) and summary sentence (at the end) both indicating, in general terms, the main point of the paragraph and containing some kinds of reference to your thesis; each paragraph should be developed to at least four sentences.