Grammar tool

Articles & prepositions — quick fixes

Article and preposition errors are the single most common reason for losing easy Grammar marks. Fixing them lifts your accuracy without learning anything new.

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Articles — the 4 rules that cover 95% of cases

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Articles — the 4 rules that cover 95% of cases

Use "a / an" when introducing a singular countable noun for the first time.
Use "the" when the noun is specific or already mentioned.
Use no article for plural and uncountable nouns when speaking generally.
Use "the" with superlatives, unique things (the sun), and most countries (the UK, the US) — but NOT with proper names of most countries (France, Japan).

Article fixes

I want to study in university.

I want to study at a university.

Government should invest in education.

The government should invest in education.

She is the best student of her class.

She is the best student in her class.

Prepositions of time

Preposition	Use	Example
at	specific times	at 9 am, at noon, at night
on	days and dates	on Monday, on 5 May
in	months, years, parts of the day	in 2024, in July, in the morning
by	deadline	by Friday, by next month
for	duration	for two hours, for six months
since	starting point	since 2020, since June

Prepositions of place

Preposition	Use	Example
at	specific point	at the station, at the door
in	enclosed space / area	in the room, in Tokyo
on	surface	on the table, on page 5
between	two items	between the trees
among	three or more	among the candidates

Editorial details and primary sources

By FluentMock Editorial Team · Published 2026-06-13 · Updated 2026-06-28 · Official sources checked

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