at dinner (breakfast, etc.)
at first notice
at first sight
at night
at table
at war
in search of
in spite of
by airmail
by letter
by telegram
by air
by car
by land
by plane
by sea
by ship (boat)
by train
by tram
by tube
by water
out of date
out of order
out of place
out of sight
arm in arm
day after day
day by day
hand in hand
night after night
night by night
a kind of
a sort of
place,
book,
task, etc.
by accident
by chance
by mistake
by name
by sight
on account of
on condition that
to be in
to go to
bed
from beginning to end
from day to day
from east to west
from head to foot
from morning to (till) night
from side to side
in debt
in demand
in secret
in sight
in time
to be at
to go to
to come to
to come from
to leave
school,
college,
(the) university
to be at
to leave
to take to
hospital
to be at
to go to
sea
in addition to
in (on) behalf of
in care of
in case of
in charge of
in reference to
to be in
to go to
church
to be at
to put to
prison
to be in
to be out of
to go to
town
to ask (for) permission
to catch (lose) sight of
to give offence (permission)
to give way to
to keep house (to do housework)
to keep time
to lose touch with
to lose track of
to make fun of
to make use of
to pay attention to
to set fire to
to shake hands with
to take care of
to take notice of
In these set expressions nouns combine with prepositions or verbs and acquire a new shade of meaning, expressing an adverbial relation, a state or a process. Concrete count nouns lose their nominal meaning. Thus He isin bed may mean He is ill, or He is asleep, or He is not up. But we say: There were no chairs enough and we sat onthe bed.
My brother goesto school (college) means He learns there. However, if we mean the building or the institution, we use an article according to the general rules, as in: We shall meet atthe school. The school isn't far from our home. Ours is a verygood school. Parents are regularly invited tothe school.
The noun town without an article means the nearest big centre of population as contrasted to the country or a smaller town, it may also denote the central part of a big town, as opposed to its suburbs.
To be at sea may mean "far away from the land" or (figuratively) "to feel puzzled"; to go to sea is "to become a sailor". But we say: The swimmer jumped into the sea. We lived near the sea, etc.
No article is used as a rule when two notions, very closely related, are mentioned, as in:
They looked like mother and daughter.
We are no longer boy and girl.
It’s no use interfering into a quarrel between husband and wife.