Complex Prepositions and Prepositional Verbs

Overview

Most learners encounter prepositions early: single words like in, on, at, by, and with that connect nouns and pronouns to the rest of a sentence. At the C1 level, two more demanding structures come into focus. Complex prepositions are fixed multi-word phrases that perform the same grammatical function as single prepositions, and prepositional verbs are combinations of a verb and a preposition that together carry a single, unified meaning distinct from either word on its own.

Neither structure is rare. Both appear frequently in formal speech, academic prose, professional writing, and legal documents. The difficulty is not in recognising them as individual items but in understanding the grammatical logic that governs them, knowing which preposition belongs with which verb, and applying each structure without error in sustained writing.

Complex Prepositions: Form and Function

A complex preposition is a group of two or three words that functions as a single preposition in a sentence. It connects a noun phrase to another element in the sentence exactly as a simple preposition would. The group as a whole is fixed: individual words within it cannot normally be substituted or reordered without breaking the meaning.

Complex prepositions fall into two main structural patterns. The first is a preposition followed by a noun followed by another preposition, producing a three-word unit. The second is an adverb or adjective followed by a single preposition, producing a two-word unit.

How Complex Prepositions Function in a Sentence

Grammatically, a complex preposition governs a noun phrase in exactly the same way a simple preposition does. The noun or noun phrase that follows it is the object of the complex preposition. The entire prepositional phrase functions as an adjunct or modifier within the clause.

In the first sentence, in spite of is the complex preposition and the heavy rain is its object. In the second, in accordance with governs the new regulations. In the third, on behalf of governs the director.

Register and Context

Complex prepositions are strongly associated with formal registers. They appear in legal writing, academic papers, official correspondence, and news reporting. In informal speech, simpler alternatives usually replace them.

Knowing when to use a complex preposition rather than its simpler counterpart is part of register control. Overusing formal complex prepositions in casual writing sounds stiff. Avoiding them entirely in academic or professional writing produces a register that is too informal.

Prepositional Verbs: Structure and Meaning

A prepositional verb is a combination of a verb and a preposition that together function as a single semantic unit. The preposition in a prepositional verb is not interchangeable: it is fixed to that verb and changes when the preposition changes. Unlike phrasal verbs, the object of a prepositional verb always follows the preposition and cannot be placed between the verb and the preposition.

In each case, the object cannot move between the verb and the preposition. "She applied the position for" and "He insisted a written contract on" are both incorrect.

Common Prepositional Verbs in Formal English

Agree On vs. Agree With

The preposition that follows agree depends on the nature of the object. Agree on is used when two or more parties reach a shared decision about something. Agree with is used when someone concurs with another person's opinion, statement, or position.

In the first sentence, they reached a mutual decision. In the second, the reviewer concurred with an opinion held by another person. This distinction extends to other prepositional verbs that shift meaning depending on which preposition follows. Differ from means to be unlike something; differ on means to hold opposing views about something. Apply for means to make a formal request; apply to means to be relevant to something. The preposition is part of the meaning, not a stylistic choice.

Complex Prepositions vs. Prepositional Verbs: A Comparison

A complex preposition can replace a simple preposition in the same slot in a sentence without altering the basic structure. A prepositional verb cannot be reduced to the verb alone without losing the specific meaning the preposition carries.

In the first pair, the complex preposition slots in where a simple preposition would sit. In the second, removing for collapses the meaning entirely — "She applied the role" is incorrect.

Common Mistakes to Avoid

Separating the Object from the Preposition in a Prepositional Verb

Unlike phrasal verbs, prepositional verbs do not allow the object to be placed between the verb and the preposition.

Omitting the Preposition from a Prepositional Verb

Each prepositional verb requires its specific preposition. Dropping it leaves the sentence grammatically incomplete or changes the meaning entirely.

Using the Wrong Preposition

The preposition in a prepositional verb is fixed and not interchangeable with a near-synonym.

Treating Complex Prepositions as Clause Connectors

Complex prepositions govern noun phrases, not full clauses. Using a complex preposition before a clause with a subject and a verb produces an incorrect sentence. A subordinating conjunction is required instead.

Using Due To as a Conjunction

Due to is a complex preposition that governs a noun phrase. It is not a conjunction and cannot introduce a clause.

"The event was cancelled because it rained heavily" is also correct, using a subordinating conjunction instead.

Confusing Prepositional Verbs with Phrasal Verbs

Phrasal verbs use particles, not true prepositions, and the particle can often be separated from the verb by the object. Prepositional verbs cannot be separated.

"She looked the information up" is correct for a phrasal verb, where the particle is separable. The same logic does not apply to prepositional verbs.

Practice Exercises

Exercise 1: Choose the Correct Preposition

Select the correct preposition to complete each sentence.

1. The committee agreed ___ a new set of procedures. (on / with)
2. This clause applies ___ all full-time employees. (for / to)
3. The fall in productivity resulted ___ a lack of resources. (from / in)
4. She objected ___ the proposed amendment. (at / to)
5. The budget shortfall accounts ___ the delay in hiring. (of / for)

Exercise 2: Identify Complex Preposition or Prepositional Verb

Label each underlined element as either a complex preposition (CP) or a prepositional verb (PV).

1. The project was completed in accordance with the original brief.
2. She referred to three separate sources in her argument.
3. The agency is operating on behalf of the local government.
4. All participants must adhere to the code of conduct.
5. Prior to the meeting, all documents should be reviewed.

Exercise 3: Correct the Error

Each sentence contains one mistake related to complex prepositions or prepositional verbs. Rewrite the sentence correctly.

1. The delay was due to the supplier failed to deliver on time.
2. In spite of he worked hard, the project fell behind schedule.
3. She applied to a research fellowship at the university.
4. The policy accounts several new safety requirements.
5. He insisted the terms on before signing the agreement.

Summary

The preposition in both complex prepositions and prepositional verbs is never decorative. It carries meaning, governs structure, and determines register.