a / an
 
abbreviations
 
about / on
 
able
 
about to do /
on the verge of /
on the point of
 
above / over
 
according to
 
across / over
 
act / action
 
ago / since / for
 
all / all of
 
all / every
 
all / whole
 
almost / nearly
 
aloud / loudly
 
also / too / as well / as well as
 
A.M. / P.M.
 
among / between
 
another
 
any / no
 
around / about
 
as / like
 
as it is / as it was /
as it were
 
   
  ago / since / for
   
A. ago는 과거에 발생한 것에 대하여 말하고자 year, month, day, time 같은 단어 다음에 사용되며 ...전에 라는 의미로 쓰인다.
1. A long time ago, this area was a forest.
2. That happened years ago.
3. I moved here eight years ago.
4. A long time ago, dinosaurs lived in this area.
   
B. since는 특정 시점이나 사건과 함께 ...이후 (지금까지), ...로부터 (지금까지) 라는 의미로 사용된다.
1. I've been waiting since three o'clock.
2. I've been waiting since 2:30.
3. She has been happier since she moved here.
4. Since leaving college, he's lived with his parents.
   
X I've been waiting from 2:30.
O I've been waiting since 2:30.
   
C. for는 과거나 미래에서 기간(amounts of time)을 나타내는 단어와 함께 ...동안 이라는 의미로 사용된다.
1. I have been waiting for three hours.
2. The building will last for years.
   
   
   
   
   
   
 
 
 
 
A long time ago, dinosaurs lived
in this area.
 
 
I've been waiting since three o'clock.
 
 
 
 
I have been waiting for three hours.
 
 
 
 
 
 
 
 
 
 
 
 
 
 
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