Preposition Usage with insisted

The sentence "He insisted ______ paying the bill" requires the correct preposition to follow the verb "insisted". When the verb "insist" is followed by a gerund (the '-ing' form of a verb) or a noun that represents the action being stressed, the standard preposition used in English is "on".

This structure emphasizes the persistence or strong assertion of the subject regarding the action.

Understanding the Rule: "Insist On"

The phrasal verb "insist on" means to demand something forcefully or to state that something must happen. It is typically followed by either a noun or a gerund.

Examples:

• They insisted on meeting the manager directly. (Here, "meeting" is a gerund)
• She insisted on a written apology. (Here, "a written apology" is a noun phrase)

Applying this rule to the given sentence, the correct completion is:

He insisted on paying the bill.

Analysis of Alternative Options

Let's look at why the other prepositions are not suitable in this context:

• at: The preposition "at" is usually used to indicate a specific point in time or a location. It is not typically used after "insist" followed by a gerund. For instance, you might say someone "insisted at the last moment," but not "insisted at paying."
• for: While "for" is used with many verbs (like "ask for," "look for"), it does not form a standard collocation with "insist" when followed by a gerund. The phrase "insisted for paying" is grammatically incorrect.
• by: The preposition "by" usually indicates the method or means by which something is done, or proximity. It does not fit the grammatical pattern required after "insist" in this specific sentence structure. "Insisted by paying" is incorrect usage.

Therefore, "on" is the most appropriate preposition to convey the intended meaning according to standard English grammar.