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Prepositions — “In”, “On”, “At” (Time & Place)

Why prepositions are chaos

French often uses one preposition where English uses three. En janvier, en France, en voiture — all "en." English? In January, in France, by car. There's no single rule, but there ARE patterns.

Time prepositions

IN → months, years, seasons, parts of day
"In January" / "In 2024" / "In summer" / "In the morning" — think: large time containers.

ON → days, dates, specific days
"On Monday" / "On March 15th" / "On my birthday" — think: specific days you can point to on a calendar.

AT → exact times, mealtimes, special periods
"At 3pm" / "At lunchtime" / "At Christmas" / "At night" — think: precise points or established moments.

Place prepositions

IN → countries, cities, enclosed spaces
"In France" / "In Lyon" / "In the office" / "In a meeting" — think: inside something.

ON → surfaces, streets, floors, transport (large)
"On the table" / "On Baker Street" / "On the 3rd floor" / "On the bus" — think: on a surface or line.

AT → specific locations, addresses, events
"At the office" / "At 42 Baker Street" / "At the conference" / "At home" — think: a point on a map.

The in/at office trap

Both are correct but different: "in the office" = physically inside the building. "At the office" = at work (could be in any room). "I left my phone in the office" (a specific room). "I'm at the office until 6" (at work generally).

Common mistakes

~~"I arrive in Monday"~~ → "I arrive on Monday." Days = on.
~~"We met in Christmas"~~ → "We met at Christmas." Holidays = at.
~~"I live in Baker Street"~~ → "I live on Baker Street." Streets = on.
~~"I'm at the meeting"~~ vs "I'm in the meeting" — both work but "in" emphasises you're currently inside it.

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