전치사(preposition)는 어떤 일이 일어난 후 얼마나 시간이 흘렀는지를 보여줄 때 종종 사용됩니다. 하루, 주, 달, 혹은 몇년이나 몇십년의 시간을 나타내줄 수 있습니다. 그럼 우리가 어떤 식으로 전치사를 사용해 시간의 흐름을 나타내는지 살펴보도록 하겠습니다.

Since
We use the preposition since to show when something started.  If we use the word since, we know that the action/time is not finished.  Look at how we use the word since.
She has been in Paris since Friday.                  I have been in school since 1989.
 
For

We use the preposition for to say how long someone has been, or will be doing something.  Look at how we use the word for.
 She has been in Paris for two years.       I have been in school for one month.
I study for one hour each day.                 I will be in London for three weeks.     
 
By

We use the preposition by to show when a task or goal ends or will be completed.  Look at how we use the word by.
 You should be home by 9 tonight.          I have to be at school by noon.
I have to finish by Monday.                    I will be in London by this summer.
 
From - To

We use the prepositions from and to, to show how long something will happen.  If we use the word from, we know when the action starts, and when it ends.  Look at how we use the words from and to as we explain when something starts, and when it ends.
 She will be in Madrid from May to June.                 I study from 7 to 9 every night.
 
From - Until

We use the prepositions from and until, to show how long something will happen.  If we use the words from and until, we know when the action starts, and when it ends.   It is the same as from and to. Look at how we use the words from and until as we explain when something starts, and when it ends.
 She lives in Paris from June until July.   I am in school from September until May.
I study from 7 until 9 every night.                   I will be in London from Sunday until Friday.
 
During

We use the preposition during to say when something happens or will happen in the future.  Look at how we use the word during.
 You should be home during the night.             I have to be at school during the day.
I am in college during the fall.                          It rains a lot during the spring.

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