Sentence fragment Silly things, to be avoided. Unless, like here, you are using them to achieve a certain effect. Don't violate this convention carelessly. Mistakes like this also occur when your verb is far from your subject. Missing comma in a series Whenever you list things, use a comma.
Many students have a problem with pronoun agreement.
Unnecessary commas with restrictive clauses See the explanation for number five, above. Fused sentences occur when two independent clauses are put together without a comma, semi-colon, or conjunction. Dangling, misplaced modifier Modifiers are any adjectives, adverbs, phrases, or clauses that a writer uses to elaborate on something. Modifiers, when used wisely, enhance your writing. One hopes that the latter is true.