Question

Find the correct preposition.
She is a doctor and she works ----------- night.

• A. for
• B. to
• C. with
• D. at

Hint:

Always memorize these fixed combinations for times of the day:

• In the morning / afternoon / evening

• At night / noon / midnight / dawn
Since there is no article "the" before "night" in the sentence, "at" is the perfect choice!

Answer 1

The Correct Option is D

Concept: Prepositions of time are words used to indicate when something happens. The primary prepositions of time are in, on, and at. Their correct usage depends on the specific time expression that follows them:

• In is used for non-specific times during a day, months, seasons, and years (e.g., in the morning, in the afternoon, in the evening, in December, in summer).

• On is used for specific days and dates (e.g., on Monday, on my birthday, on the 25th of March).

• At is used for precise times, specific points in the day, and uniquely with the word "night" when referring to the period as a whole (e.g., at 3 o'clock, at noon, at midnight, at night).

Detailed Rule for "Night":

• While we say "in

the morning" or "in

the evening" (which require a definite article), the standard grammatical construction for the general time period of darkness is a fixed phrase:

"at night".

• Note: We only use "in the night" when talking about a specific, single night during which an event occurred (e.g., "I woke up in the night"). When talking about general habits, professions, routines, or continuous characteristics,

"at night" is the established standard expression.

• In the given sentence, "She is a doctor and she works at night," we are describing her regular professional routine and shift pattern. Thus, "at" is grammatically mandatory.

Analysis of Options:

• Option (A) is incorrect because "works for night" does not fit standard time indications; you work for a company or a cause, not a period of time.

• Option (B) is incorrect because "works to night" is an improper prepositional construct for designating daily shifts.

• Option (C) is incorrect because "with night" is conceptually invalid.

• Option (D) is correct because "at night" is the idiomatic and grammatically accurate prepositional phrase for general time expressions involving the word night.