"In three years of teaching that course, I learned that students -- some of them in their thirties and forties -- committed many of the same errors in class after class.
- They wrote unintended sentence fragments.
- They wrote run-on sentences or spliced together sentences with a lowly comma.
- They failed to make subjects agree with verbs, or pronouns with antecedents.
- They misplaced modifiers. ("Last night I shot an elephant in my pajamas. How he got in my pajamas I'll never know.")
- They confused "who" and "whom" and made other case errors.
- They could not form the possessive correctly.
- They misspelled many words.
- They had little control of punctuation.
- They'd often confuse one word or phrase for another ("discrete" with "discreet"). "