Elements and Building Blocks of Sentences

A sentence is a grammatical unit that expresses a complete proposition, question, command, exclamation, or other communicative function. Understanding sentence structure requires identifying the roles played by its different elements.

The two most fundamental elements are the subject and the predicate.

The students completed the assignment.

Here, the students is the subject, while completed the assignment is the predicate.

Subject

The subject is the person, thing, or idea that a clause is about or that performs, experiences, or undergoes the action expressed by the verb.

Ali works in Islamabad.
The children are playing.
Honesty is important.

The subject may be a single word or a complete noun phrase:

The new students in our class arrived early.

Predicate

The predicate contains the verb and everything that belongs with it:

The students completed their assignment.
She has been working all morning.

A predicate may therefore contain objects, complements, adverbials, and other elements.

Objects

An object is typically a noun phrase or similar unit affected by or involved in the action of a transitive verb.

A direct object occurs directly after the verb:

She opened the door.
They bought a car.

An indirect object commonly identifies the recipient or beneficiary:

She gave her brother a book.

Here, her brother is the indirect object and a book is the direct object.

The same meaning can often be expressed with a prepositional phrase:

She gave a book to her brother.

Complements

A complement completes the meaning of another element.

A subject complement follows a linking verb:

He is a doctor.
The soup tastes delicious.

An object complement describes or identifies the object:

They elected him president.
The news made her happy.

Adverbials

An adverbial provides information about circumstances such as time, place, manner, frequency, reason, or condition:

She arrived yesterday.
He works in Lahore.
They spoke quietly.

Adverbials can be single words, phrases, or clauses.

Basic Sentence Formula

A useful starting pattern is:

Subject + Verb + Object

The student read the book.

But English sentences can contain many other combinations:

The student is tired.
The student gave his teacher a letter.
The student worked carefully in the library yesterday.

Understanding these building blocks makes it easier to analyze increasingly complex sentences.