3.1 Sentence Structure & Parts of Speech

3.1 Sentence Structure & Parts of Speech

Quick Answer: A grammatical sentence has a subject and a finite verb that together express a complete idea. Phrases lack a subject–verb pair; clauses have both. Independent clauses can stand alone; dependent clauses cannot. Mastering parts of speech and clause structure helps you fix fragments, choose correct options, and read official notices accurately.

English Language questions on the Public Service Commission (PSC) entrance paper for Firefighter Grade 1 routinely test whether you can recognise a complete sentence, name how a word is used, or pick the option that is structured correctly. This section builds that foundation with short examples drawn from public notices, civic announcements, and ordinary Trinidad and Tobago public-service contexts—not technical fireground operations.

Why Sentence Structure Matters on the Exam

Civil-service English items often look like this:

• Choose the option that is a complete sentence (not a fragment).
• Identify the part of speech of a bolded word in a sentence.
• Select the sentence that is correctly constructed among options with missing subjects, missing verbs, or run-ons.
• Distinguish a phrase from a clause.

You do not need literary analysis. You need reliable labels and a fast checklist for completeness.

What Makes a Complete Sentence

A complete sentence (also called an independent clause when it stands alone) has three requirements:

1. A subject — who or what the sentence is about.
2. A finite verb — a verb that shows tense (is, was, wrote, will announce).
3. A complete idea — the thought does not leave the reader hanging as if another half is missing.

Examples (complete):

• The Ministry published the recruitment notice on its website.
• Candidates must bring original documents to the interview.
• Port of Spain remains the capital of Trinidad and Tobago.

Fragments (incomplete):

Exam tip: If you can ask “What about it?” and the group never answers, you probably have a fragment. If the group starts with because, although, when, if, since, while, after, before, unless and nothing independent follows, it is usually incomplete.

The Eight Parts of Speech

Traditional school grammar names eight parts of speech. The same word can change role depending on use.

Function over appearance

Do not fix a label from the dictionary alone—watch the function:

• Report as noun: The officer filed a report.
• Report as verb: Candidates must report to the venue by 8:00 a.m.
• Official as adjective: The official notice is on the website.
• Official as noun: A senior official signed the letter.

Helping verbs and main verbs

A verb phrase can include helping (auxiliary) verbs plus a main verb: has submitted, will be interviewed, must bring. Treat the whole phrase as the verb unit when checking completeness, but still identify the main lexical verb when an item asks “which word is the verb?”

Determiners and articles

Words such as a, an, the, this, those, every, several often sit before nouns. Many school papers group articles with adjectives or call them determiners. For MCQs, if options list “adjective” and the word is national in national holiday, choose adjective; if the bolded word is the, choose the label your syllabus expects (often article or determiner if offered).

Phrases vs Clauses

This distinction appears constantly on entrance-style English papers.

Phrase

A phrase is a group of related words without both a subject and a finite verb working as a clause.

None of those can stand alone as a full sentence.

Clause

A clause has a subject and a finite verb.

Dependent clauses usually begin with:

• Subordinating conjunctions: because, although, if, when, while, since, unless, after, before, until, as
• Relative pronouns: who, whom, whose, which, that

Examples:

• Independent: The notice closed last Friday.
• Dependent (adverbial): Because the notice closed last Friday, late applications were refused.
• Dependent (relative/adjectival): Applicants who meet the age requirement may sit the examination.
• Dependent (nominal): The circular stated that documents must be certified.

Four Sentence Types by Structure

Coordinating conjunctions (FANBOYS)

Remember FANBOYS: for, and, nor, but, or, yet, so. They join equals—two independent clauses, two nouns, two phrases of the same kind. Using a comma plus FANBOYS between full clauses is standard; joining two full clauses with only a comma (comma splice) is an error you will meet in Section 3.4.

Run-ons vs fragments

• Fragment: missing subject, finite verb, or complete idea.
• Run-on / fused sentence: two independent clauses jammed together with no proper join: The list was posted candidates rushed to check it.
• Comma splice: same problem with only a comma: The list was posted, candidates rushed to check it.

Repairs for run-ons: full stop; semicolon; comma + coordinating conjunction; or make one clause dependent.

Subjects: Finding the True Head

The grammatical subject is often not the last noun before the verb.

• The list of successful candidates was published on Monday. (Subject: list, not candidates)
• One of the notices contains an error. (Subject: one)
• There are three centres in Trinidad and one in Tobago. (There is not the true subject; the verb agrees with centres…—more in 3.2.)

Underline the head noun of the subject phrase before you decide anything about agreement or completeness.

Worked Micro-Examples (Exam Style)

1. Part of speech
Sentence: The eligible candidates received letters.
Eligible describes candidates → adjective.

2. Phrase or clause?
“In accordance with the published schedule” → phrase (prepositional; no finite verb for a clause).
“When the schedule was published” → clause (subject schedule, verb was published).

3. Sentence type
“Although the hall was crowded, the invigilators kept order.” → complex (dependent + independent).

4. Completeness
“Although the hall was crowded.” → fragment (dependent clause alone).

Reading Official Notices with Grammar Eyes

Public notices often use long noun phrases and prepositional strings:

Candidates for appointment to the office of Firefighter Grade 1 in the Fire Service Division must satisfy the published eligibility requirements.

Break it down:

• Subject phrase: Candidates for appointment to the office of Firefighter Grade 1 in the Fire Service Division
• Finite verb: must satisfy
• Object: the published eligibility requirements

You do not need firefighting technical knowledge to parse the grammar. You only need to see who must do what.

Common Traps in Sentence-Structure Items

Study Routine for This Topic

1. Label subject and finite verb in five sentences from any official notice or newspaper civic page.
2. Circle every subordinating word (because, if, when, who, that) and mark the clause as independent or dependent.
3. Build one simple, one compound, one complex, and one compound-complex sentence on the same idea (for example, checking an examination list).
4. Rewrite three fragments into complete sentences and three run-ons into correct joins.

Strong structure skills feed every later English topic: agreement, tense, and usage errors all rest on seeing subjects, verbs, phrases, and clauses clearly.