Spanish Sentence Structure and Verb Complements

Direct Object (CD) in Spanish Grammar

CD (Complemento Directo): This refers to a person or thing that receives the action of transitive verbs. These verbs are characterized by having an incomplete meaning that necessarily requires a direct object to be specified.

How to Identify the Direct Object

• Replace the CD with the pronouns lo, la, los, or las.
• Transform the active sentence into a passive one; the CD will become the patient subject.
• Changing the verb does not affect the CD.
• Do not ask "who" or "what" to identify it, as this can lead to errors.

Indirect Object (CI) Identification

CI (Complemento Indirecto): This indicates the person or thing that is addressed, suffers, or benefits from the action of a verb. It is possible to find a double indirect object in some sentences.

How to Identify the Indirect Object

• Check if the indirect object is a prepositional phrase (C.prep) starting with "a" + a noun phrase (SN) or an unstressed pronoun (me, te, le, nos, os, les).
• When transforming a sentence from active to passive, the CI remains unchanged.
• Verify that the CI is not an unstressed pronoun acting as a CD.

Prepositional Complement (CRV) Rules

CRV (Complemento de Régimen Verbal): This is a mandatory complement for certain verbs that must be conjugated with a specific preposition (e.g., trust in). Some of these verbs can be used without a preposition, but doing so changes their meaning.

How to Identify the CRV

• The CRV is required by the verb and is introduced by a preposition such as a, con, de, en, or por.
• Replace the phrase with a tonic pronoun (él, ella, ello, eso).
• Transform the CRV into a question using "preposition + who/what".
• It cannot be replaced by an unstressed pronoun or an adverb.

Circumstantial Complement (CC) Types

CC (Complemento Circunstancial): This specifies the circumstances under which the action of the verb develops, such as time, place, manner, instrument, cause, purpose, company, or field.

How to Identify the CC

• Check its form: it can be an adverbial phrase (S.adv), a prepositional phrase (C.prep), or a noun phrase (SN).
• Try to replace the CC with an adverb.
• If you remove it from the sentence and the sentence remains grammatical, it is likely a CC. However, if the CC is required by the verb, it cannot be eliminated.

Predicative Complement (C. PVO) Usage

C. PVO (Complemento Predicativo): This functions as an adjective that complements both the verb and the subject (or the CD) of the sentence. It is sometimes expressed as a noun phrase (SN).

How to Identify the C. PVO

• Verify its form and check for agreement in gender and number with the subject or the CD.
• Ensure the verb in the sentence is predicative.
• Do not confuse the C. PVO with an attribute, a CD, or a CC.

Agent Complement (Cag) in Passive Voice

Cag (Complemento Agente): This refers to the entity that performs the action in passive sentences.

How to Identify the Cag

• Confirm that the sentence is in the passive voice.
• The Cag is always a prepositional phrase introduced by the word "por" (by).
• When converting to an active sentence, the Cag becomes the subject.
• Do not confuse the Cag with a CRV or a CC.