4.2 Syntax & Sentence Structure

Syntax and Sentence Structure

Syntax is the arrangement of words into phrases, clauses, and sentences. Praxis 5038 tests whether you can classify structures and, more often, revise faulty sentences for both correctness and effectiveness.

Phrases versus Clauses

A phrase is a group of words with no subject-verb pair; a clause has both a subject and a verb.

• Prepositional phrase: 'in the morning'
• Participial phrase (works as an adjective): 'Covered in mud, the dog...'
• Gerund phrase (works as a noun): 'Swimming every day kept her fit'
• Infinitive phrase: 'To win the prize was her only goal'
• Appositive phrase (renames an adjacent noun): 'My brother, a doctor, lives in Chicago'

Clauses come in two kinds. An independent clause (IC) expresses a complete thought and can stand alone ('The dog barked'). A dependent (subordinate) clause (DC) cannot stand alone because a subordinator such as because, when, although, or which makes it incomplete ('Because the dog barked'). Dependent clauses fill three roles: an adjective clause modifies a noun ('the house which had been vacant for years'), an adverb clause modifies a verb ('when the bell rang'), and a noun clause works as a subject or object ('What she said surprised everyone').

The Four Sentence Structures

Classification depends entirely on counting independent and dependent clauses.

A reliable method: find the independent clauses first (each could be its own sentence), then check for any subordinate clause. Two independent clauses plus one dependent clause equals a compound-complex sentence.

Sentence Purpose

Sentences are also classified by function: declarative (states an idea, ends with a period), interrogative (asks a question, ends with a question mark), imperative (gives a command, with an understood 'you' subject), and exclamatory (expresses strong emotion, ends with an exclamation point). Recognizing purpose supports both grammar items and rhetoric/writing items about tone and audience.

Parallelism

Parallel structure requires items in a series or comparison to share the same grammatical form. Faulty: 'to practice hard, to eat well, and that they should rest'. Parallel: 'to practice hard, to eat well, and to rest'. Mixing gerunds and infinitives ('I like swimming, hiking, and to run') also breaks parallelism; make them all gerunds ('swimming, hiking, and running'). Watch correlative conjunctions (not only...but also, either...or, both...and): the structure that follows each half must match.

Misplaced and Dangling Modifiers

A misplaced modifier sits next to the wrong word: 'Running across the street, the car almost hit the pedestrian' wrongly says the car was running. A dangling modifier has no word in the sentence to modify: 'After reading the original study, the article remains unconvincing' — there is no one in the sentence who read the study. Fix a dangler by naming the actor immediately after the modifier: 'After reading the original study, I found the article unconvincing'. The rule: an introductory verbal phrase must be followed at once by the noun it describes.

Fragments, Run-ons, and Comma Splices

• A fragment lacks a subject, a verb, or a complete thought ('Because the dog barked'). Fix it by attaching it to an independent clause.
• A run-on (fused) sentence jams two independent clauses together with no punctuation ('The dog barked the cat ran away').
• A comma splice joins two independent clauses with only a comma ('The sun is shining, it is a beautiful day').

Four legitimate fixes for run-ons and comma splices:

1. Period — write two separate sentences.
2. Semicolon — 'The sun is shining; it is a beautiful day'.
3. Comma + coordinating conjunction (FANBOYS) — '..., and it is a beautiful day'.
4. Subordinate one clause — 'Because the sun is shining, it is a beautiful day'.

Sentence Combining and Effectiveness

Many 5038 revision items ask for the most effective combination, not merely a correct one. Prefer versions that are concise, subordinate the less-important idea, avoid needless passive voice, and preserve the writer's emphasis. Choppy: 'The report was late. It still earned praise'. Combined: 'Although the report was late, it still earned praise' — the subordinator shows the relationship and reads smoothly.

Worked Revision Item

Original: 'The committee reviewed the proposal, they approved it unanimously.' Two independent clauses are spliced by a comma. The best revision joins them logically: 'The committee reviewed the proposal and approved it unanimously', or with a semicolon if you want two balanced statements. On the exam, first diagnose the error type, then choose the option that fixes it without introducing a new error — a common wrong answer trades a comma splice for a fragment.

Restrictive versus Nonrestrictive Clauses

Syntax and punctuation intersect in the restrictive/nonrestrictive distinction, which 5038 tests directly. A restrictive (essential) clause narrows the noun and is required for meaning, so it takes no commas and usually begins with that: 'The book that I ordered arrived'. A nonrestrictive (nonessential) clause adds extra information, is set off by commas, and typically uses which or who: 'My car, which is ten years old, still runs'. Removing a nonrestrictive clause leaves the sentence's core meaning intact; removing a restrictive one changes which noun you mean. Choosing which versus that — and the commas that accompany them — is a recurring right/wrong split in the answer choices.

Common Syntax Trap

Watch for answer choices that are grammatically correct but less effective. If two options both fix a run-on, prefer the one that shows the logical relationship (cause, contrast, sequence) through subordination rather than a bare 'and'. The exam's 'best' answer preserves the writer's emphasis and reads most smoothly, not merely the first technically correct fix you see.