急!!英文

past continuous tense is the mixture of past tense and continuous tense.
It is used when there are words of while, when , etc.
it means that sb was doing sth when another one was doing something at the same time in the past.
just like present continuous tense , but it was happenning in the past.

Total 有5個用法, 因為太多既關係, 你可以上呢個網址睇http://www.englishpage.com/verbpage/pastcontinuous.html

好詳細的, 希望可以幫到你~^^~