Correcting Sentence Grammar: 'Informful' vs. 'Informative'

The question asks us to identify the correct word to replace the non-standard word 'informful' in the sentence: "The documentary was both informful and engaging." We need to find an adjective that fits grammatically and makes sense in the context.

Understanding Sentence Structure

The sentence uses the correlative conjunctions 'both...and...' to connect two descriptive words (adjectives) for the documentary. One adjective is 'engaging'. The word replacing 'informful' must also be an adjective and should convey a similar positive quality related to providing information.

Analyzing Word Options

Let's look at the provided options:

• Option 1: informational
  This is an adjective, meaning "relating to or containing information". While grammatically possible, it often describes material *about* information rather than the direct quality of providing it effectively.
• Option 2: information
  This is a noun. It cannot function as an adjective in this sentence structure.
• Option 3: informant
  This is a noun referring to a person who provides information. It's completely unsuitable for describing a documentary.
• Option 4: informative
  This is an adjective meaning "providing useful or interesting information". This word perfectly describes the quality of a documentary that successfully shares knowledge in an engaging manner. It fits the parallel structure with 'engaging' and is the standard, correct word.

Identifying the Best Fit

The word 'informful' is not a standard English word. The sentence intends to say that the documentary provided a lot of information and was also engaging. The adjective 'informative' accurately captures this meaning.

Comparing 'informational' and 'informative':

• 'Informative' describes something that provides information well. (e.g., an informative speech, an informative article, an informative documentary).
• 'Informational' often relates to the process or content of information itself. (e.g., informational material, informational interview).

In the context "both ______ and engaging," the adjective 'informative' fits the meaning and grammatical structure best, describing the documentary's positive characteristic of imparting knowledge effectively alongside being captivating.

The Corrected Sentence

By replacing 'informful' with 'informative', the sentence becomes grammatically correct and clear:

The documentary was both informative and engaging.