第1个回答 2020-02-16
1.
表示年、月、日时刻等用at，in，on1）at
用于表示时刻、时间的某一点
at
noon
,
at
night
,
at
present
,
at
8
o'clock
eg:
We
usually
have
lunch
at
12.
2）on
用于某天，某天的上、下午（指具体某一天时，一律用on）
on
Monday
,
on
Tuesday
morning
,
on
June
12th
,
on
a
cold
night
,
on
the
night
of
May
1st
eg:
We
didn't
listen
to
the
lecture
on
Friday
afternoon.
3）in
用于表示周、月、季节、年，泛指的上午、下午、晚上
in
the
week
,
in
May
,
in
spring
,
in
1992
,
in
the
morning
,
in
the
afternoon
,
in
the
night
eg:
People
go
skating
in
winter.
2.
表示时间的前后用before，after1)
before
在...之前
eg:
Wash
your
hands
before
dinner.
He
will
call
me
before
he
leaves
here.
2)
after
在...之后
eg:
Let's
sing
some
songs
after
school.
Please
close
the
door
after
you
leave
the
room.
3.
表示期限等用by，untill，till1)
by
在...之前;截至...
eg:
How
many
English
books
had
you
read
by
the
end
of
last
year.
2)
untill(till)
直到...为止
(untill
与
till
可通用)
eg:
We
didn't
begin
to
watch
TV
untill
(till)
nine
o'clock.
I'll
wait
for
him
untill
he
comes
here.
4.
表示期间等用for，during，through1)
for
达...之久
eg:
He
has
lived
here
for
20
years.
We
will
stay
in
the
city
for
two
days.
2)
during
在...期间
eg:
They
are
going
to
have
a
good
rest
during
the
summer
holidays.
3)
through
一直...(从开始到结束)
eg:
They
played
the
cards
through
the
night.
5.
表示时间的起点等用from，since1)
from
从...起(时间)
eg:
The
meeting
will
be
held
from
eight
to
ten.
The
meeting
will
be
held
at
eight
2)
since
自从...以来(表示从以前某时一直到现在仍在继续)
eg:
I
have
been
sick
since
yesterday.
The
doctor
has
saved
a
lot
of
lives
since
he
became
a
doctor.
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with,without,before,between,except,and,qr^……还有很多啦，书后的单词表里有，音标后注有“prep.”的就是介词。
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介词很多，有：指地点、时间、方位、范围.......