Understanding Sentence Improvement and Subject-Verb Agreement

The question asks us to improve the bracketed part of the sentence: "I understood that we (is influenced) by what we see, what we hear." We need to examine the phrase "(is influenced)" in the context of the sentence to ensure it is grammatically correct, specifically focusing on subject-verb agreement and the correct verb form.

Let's break down the original phrase and the sentence:

• The subject of the clause "we (is influenced) by what we see, what we hear" is "we".
• "We" is a plural pronoun.
• The verb form used is "is influenced".
• The verb "is" is singular and is used with singular subjects (like he, she, it).
• Therefore, there is a subject-verb agreement error: the plural subject "we" does not agree with the singular verb "is".
• The phrase "is influenced" is in the passive voice (form of 'be' + past participle). The passive voice is appropriate here because "we" are receiving the action (being influenced), rather than performing it. However, the form of 'be' needs to agree with the subject.

Analyzing the Improvement Options

Now let's look at the given alternatives to see which one correctly addresses the grammatical error and improves the sentence.

1. Was influenced: This uses the past tense form "was influenced". While "influenced" is the correct past participle for the passive voice, "was" is a singular past tense verb and does not agree with the plural subject "we". The correct past tense form for a plural subject is "were". Also, the clause "we are influenced..." describes a general truth that is relevant in the present, even if the understanding happened in the past.
2. Are influence: This uses the correct plural present tense verb "are" which agrees with the subject "we". However, "influence" is the base form of the verb or a noun. For the passive voice, we need the past participle, which is "influenced". So, "are influence" is grammatically incorrect.
3. Are influenced: This option uses "are", which is the correct plural present tense form of the verb "to be" and agrees with the plural subject "we". It also uses "influenced", which is the correct past participle needed for the passive voice structure (form of 'be' + past participle). "We are influenced" is a grammatically correct phrase that describes a general truth using the passive voice with proper subject-verb agreement.
4. No improvement: As identified earlier, the original phrase "is influenced" contains a subject-verb agreement error ("we" requires a plural verb, not "is"). Therefore, improvement is needed.

Selecting the Correct Improvement

Based on the analysis, the phrase "Are influenced" is the only option that correctly uses a plural verb ("are") that agrees with the subject ("we") and maintains the correct passive voice structure ("are" + past participle "influenced"). This correction resolves the grammatical error present in the original sentence.

The corrected sentence is: I understood that we are influenced by what we see, what we hear.

Revision Table: Key Grammar Points

Additional Information on Sentence Structure and Verb Usage

Understanding the different parts of a sentence and how verbs function is crucial for sentence improvement. Let's look at some related concepts.

• Clause: A clause is a group of words that contains a subject and a verb. In the given sentence, "that we are influenced by what we see, what we hear" is a subordinate clause.
• Main Verb vs. Auxiliary Verb: In the passive voice construction "are influenced", "are" is an auxiliary (or helping) verb (a form of 'be'), and "influenced" is the main verb (in its past participle form).
• Active vs. Passive Voice:
  • Active Voice: The subject performs the action (e.g., "What we see and hear influences us.").
  • Passive Voice: The subject receives the action (e.g., "We are influenced by what we see and hear."). Both are grammatically correct, but the choice depends on emphasis. The original sentence structure uses the passive voice, and the correct improvement maintains this.
• Pronoun Usage: Pronouns like "we" are substitutes for nouns. It's important to use the correct verb form that agrees with the pronoun being used as the subject.

By carefully analyzing the subject, verb, and intended meaning, we can identify and correct grammatical errors like subject-verb agreement and ensure the correct verb form and voice are used for effective communication.