Sentence and Its Elements: Subject, Predicate, Objects

Learning objectives

By the end of this lesson, you should be able to identify a sentence's subject and predicate, distinguish objects from complements, recognise common phrase and clause patterns, and analyse basic sentence structures.

Find the subject and the main verb or verb phrase.
Distinguish direct objects, indirect objects and subject/object complements.
Recognise phrases and clauses.
Use sentence patterns to diagnose common errors.

1. What is a sentence?

A sentence is a grammatical unit that expresses a statement, question, command or exclamation. A complete independent clause normally contains a subject and a predicate, although commands often have an understood subject (you).

Complete: “The students finished the assignment.”
Incomplete fragment: “Because the students finished the assignment.”
The second example is usually incomplete when it stands alone because because introduces a dependent clause and leaves the reader waiting for the main idea.

বাংলা সহায়তা: পূর্ণাঙ্গ বাক্যে একটি সম্পূর্ণ ভাব প্রকাশ পায়। শুধু কয়েকটি শব্দ থাকলেই তা পূর্ণাঙ্গ বাক্য হয় না; শব্দগুলোর ব্যাকরণগত সম্পর্ক ও অর্থও গুরুত্বপূর্ণ।

Sentence and clause

A sentence may contain one clause or several clauses. An independent clause can stand alone as a sentence; a dependent clause normally relies on another clause to complete the thought.

One independent clause: “Mina smiled.”
Two clauses: “Mina smiled because she knew the answer.” — Mina smiled is independent; because she knew the answer is dependent.

2. Subject and predicate

The subject tells whom or what the clause is about. The predicate says something about the subject and includes the verb. In many sentences, the predicate also contains an object, complement or adverbial.

Sentence	Subject	Predicate
The little boy laughed.	The little boy	laughed
Our English teacher explained the rule clearly.	Our English teacher	explained the rule clearly
Several students have been preparing for the exam.	Several students	have been preparing for the exam
There are two books on the desk.	two books (the notional subject)	are on the desk
Close the door, please.	you (understood)	close the door, please

Tip: Find the verb first, then ask who or what performs the action or is described. Be careful with introductory words such as there and with questions, where word order can change.

Question: “Where are the keys?” The subject is the keys, not where. The verb are comes before the subject because this is a question.

3. Objects and complements

Not every verb needs an object. An object is affected by or involved in the action; a complement completes or describes the meaning of another element. Identify the role from the sentence pattern, not from the word alone.

Element	Function	Example
Direct object (DO)	Receives the action of a transitive verb.	Rafi opened the window.
Indirect object (IO)	Often identifies the recipient or beneficiary.	Rafi gave his sister a book.
Subject complement (SC)	Identifies or describes the subject after a linking verb.	The sky became dark.
Object complement (OC)	Identifies or describes the object.	They elected Rina captain.
Adverbial	Adds information such as time, place, manner or reason.	We met after class.

Direct and indirect objects

In “The coach gave the players instructions,” instructions is the direct object and the players is the indirect object. The sentence can also be written “The coach gave instructions to the players.” In this version, to the players is a prepositional phrase rather than an indirect object in the same grammatical position.

Subject complements

Linking verbs such as be, seem, become, feel, look and remain may connect the subject to a complement.

“Nadia is a doctor.” — a doctor identifies Nadia (noun phrase).
“Nadia seems tired.” — tired describes Nadia (adjective).
Neither a doctor nor tired is a direct object here.

Object complements

In “The committee found the plan useful,” the object is the plan and useful describes that object. Compare: “The committee discussed the plan.” Here, the plan is an object, but there is no object complement.

4. Five common sentence patterns

These patterns are a useful way to analyse many basic English clauses. Real sentences can be more complex, and optional adverbials may be added to most patterns.

Pattern	Example	Analysis
Subject + Verb (SV)	Birds fly.	Birds = subject; fly = intransitive verb.
Subject + Verb + Object (SVO)	Sam reads books.	books = direct object.
Subject + Verb + Complement (SVC)	The soup smells delicious.	delicious = subject complement.
Subject + Verb + Indirect Object + Direct Object (SVOO)	She sent me a message.	me = indirect object; a message = direct object.
Subject + Verb + Object + Complement (SVOC)	They painted the door red.	the door = object; red = object complement.

Some grammar books also teach a pattern with an obligatory adverbial, as in “She lives in Dhaka.” The exact number of patterns may differ between textbooks because frameworks classify some complements and adverbials differently.

5. Phrases and clauses

A phrase is a group of words that functions as a unit but does not normally contain a complete subject–finite-verb relationship. A clause contains a subject and a predicate, though the subject may be understood in commands.

Unit	Example	How it works
Noun phrase	the tall building	Functions like a noun phrase; it can be a subject or object.
Prepositional phrase	near the station	Begins with a preposition and adds a relation.
Verb phrase	has been studying	Contains a main verb and any auxiliaries.
Independent clause	The train arrived.	Can stand alone as a sentence.
Dependent clause	when the train arrived	Usually needs a main clause in standard use.

Combined example: “The student who won the prize thanked her teacher after the ceremony.” The subject is the noun phrase The student who won the prize; the relative clause who won the prize describes student; after the ceremony is a prepositional phrase functioning as an adverbial.

6. Common sentence errors

Sentence fragment

Incorrect as a complete sentence: “Although the weather was cold.”
Correct: “Although the weather was cold, we went outside.”

Run-on sentence

Incorrect: “The bell rang the students left.”
Correct: “The bell rang, and the students left.” Or: “The bell rang. The students left.”

Subject–verb disagreement

Incorrect: “The list of names are on the table.”
Correct: “The list of names is on the table.” The head noun list is singular; the phrase of names does not change the subject’s number.

Confusing an object with a complement

In “The milk turned sour,” sour is a subject complement after the linking verb turned; it is not an object. In “She turned the key,” the key is the object of an action verb.

7. Guided practice

Identify the bold element or choose the best analysis. Try to answer before revealing the key.

In “The young athlete won the race,” what is the subject? young athlete
In “The children laughed loudly,” what is the main verb? laughed
In “Mina wrote a letter,” identify the direct object: a letter
In “The room became quiet,” identify the subject complement: quiet
In “The teacher gave us homework,” identify the indirect object: us
In “They named the puppy Max,” identify the object complement: Max
Is “under the bridge” a phrase or a clause?
Is “because he was ill” independent or dependent?
Which pattern fits “Flowers bloom”? (SV / SVO / SVC)
Which pattern fits “The news made her happy”? (SVO / SVC / SVOC)
Correct the fragment: “When the lesson ended.”
In “The book on the shelf belongs to me,” what is the subject’s head noun?
In “There are three chairs in the room,” what is the notional subject?
In “My brother is a pilot,” is “a pilot” an object or a subject complement?
In “We waited at the gate,” what function does “at the gate” perform?

Show answer key and explanations

The young athlete — the full noun phrase is the subject; “young” modifies “athlete”.
laughed — the main verb expresses the action/event.
a letter — it receives the action of “wrote”.
quiet — it describes the subject “the room” after the linking verb “became”.
us — it identifies the recipients of the homework.
Max — it renames the object “the puppy”.
Phrase — it has no subject–finite-verb clause structure.
Dependent clause — “because” introduces a reason clause that usually needs a main clause.
SV — “Flowers” is the subject and “bloom” is an intransitive verb here.
SVOC — “her” is the object and “happy” is the object complement.
Example correction: “When the lesson ended, we went home.” Other complete main clauses are possible.
book — it is the head noun of the subject noun phrase; “on the shelf” modifies it.
three chairs — “there” is a grammatical introductory/dummy subject in this construction.
Subject complement — “a pilot” identifies the subject “my brother” after “is”.
Adverbial of place — the prepositional phrase says where we waited.

শিক্ষণ-পরামর্শ: শুধু উত্তর মিলিয়ে থেমে যাবেন না। ভুল হলে সংশ্লিষ্ট নিয়মটি আবার পড়ে একই ধরনের নতুন বাক্য তৈরি করুন।

8. Revision checklist

I can find the subject and predicate in a basic statement.
I can distinguish a direct object from a subject complement.
I can identify indirect objects and object complements in common patterns.
I can tell a phrase from an independent or dependent clause.
I can recognise fragments, run-ons and basic agreement errors.

When you can explain why an answer is correct, rather than only recall it, you are ready to continue to the next chapter.

Continue learning and practise

Chapter 01 explains word classes; this chapter shows how those words combine into sentence elements. Next, Chapter 03 will cover nouns in greater depth.

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Editorial note: Grammar terminology can vary slightly across textbooks. For a specific examination, use the definitions and conventions stated in its syllabus.