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  1. #1
    sio is offline Junior Member
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    Question past progressive v.s. past perfect progressive

    teachers,

    I need your explanations. Thanks!

    1a. I was studying when they came.
    1b. I had been studying for two hours when before they came.

    They (1a + 1b) have the same meaning, don't they?
    The difference is the time signal (b): for two hours (emphazing the length of time).



    2. I found the following prepositions in some articles:

    in a university
    at a university
    at the Oxford University (certain university)

    Are those correct? If yes, what is the difference between in a university and
    at a university? Can we omit a to refer to any university in general?
    Last edited by sio; 29-Dec-2008 at 05:40.

  2. #2
    engee30's Avatar
    engee30 is offline Key Member
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    Smile Re: past progressive v.s. past perfect progressive

    Quote Originally Posted by sio View Post
    teachers,

    I need your explanations. Thanks!

    1a. I was studying when they came.
    1b. I had been studying for two hours when before they came.

    They (1a + 1b) have the same meaning, don't they?
    The difference is the time signal (b): for two hours (emphazing the length of time).



    2. I found the following prepositions in some articles:

    in a university
    at a university
    at the Oxford University (certain university)

    Are those correct? If yes, what is the difference between in a university and
    at a university? Can we omit a to refer to any university in general?
    I was studying (or I had been studying) when they came. (the moment they came, I was in the process of studying)

    I had been studying (not I was studying) for two hours when they came. (just as you said, the mention of the duration of time, ie for two hours, determines the use of the past perfect continuous tense)
    ____________________
    As for your second query - your understanding of the matter is spot-on (except for one thing - at/in Oxford University - no article needed)

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