Articles: a, an, the, zero article

with and adjective to mean a particular group of people

we use to refer things that have already been mentioned

cities

with jobs, illnesses, some numbers

lakes

languages

school subjects

for some set expressions (on ? foot, on ? holiday, at ? noon)

games, sports

in set phrases or expressions ( ? couple of weeks, once in ? while, twice ? week)

for some important buildings

to refer to things in general

newspapers, inventions, musical instruments

seas

for rivers

mountains

for superlatives

streets

shops, restaurants, individual people

with singular countable nouns mentioned for the first time

for deserts

we use to refer to specific things

for some institutions, unless we are just visiting

for some countries

most continents

uncountable nouns or plural nouns, unless referring to a specific group

when there is only one

most countries

oceans

plural names of mountain ranges