过去进行时也常用以表示暂时的形势。
The past continuous is often used to refer to a temporary situation.
我走近花园时，几个男孩子在爬树。（用过去进行时）
上星期天，我和往常一样，又去河边坐着。河岸上有些孩子正在玩耍，河面上有些人正在划船。(过去进行时描述背景)。
Last Sunday, I went and sat on the river bank as usual. Some children were playing games on the bank and there were some people rowing on the river.
我们用过去完成进行时态来形容一个在过去开始的行动，这个行动持续到过去的另一个时间。
We use the past perfect continuous tense to show that an action started in the past and continued up until another time in the past.
掌握现在时，过去时，未来时， 进行时， 完成时的各种用法。
To grasp the usage of the tenses, including the present, past, future tense and continue, perfect tense.
当你已经毕业了，你就不能再用现在进行时了，应该用过去时来表达。
Nancy:If you have graduated, then you have to say, "I majored in English, " using past tense.
晚清的乌托邦小说在时间构形上通常表现为“将来过去时”、“将来完成时”和“将来进行时”等三种不同面相。
There are three kinds of shapes of the tenses in the Utopia Novels of the later Qing Dynasty: the future past tense, the future perfect tense and the future continuous tense.
我明天会吃米饭。我上周吃了米饭。（将来进行时转化成一般过去时）
Eg. I will be eating rice tomorrow. – I ate rice last week. (Future continuous-simple past)
英文摘要时态的运用也以简练为佳，常用一般现在时、一般过去时，少用现在完成时、过去完成时，进行时态和其他复合时态基本不用。
The use of tenses in English also is better to concise, commonly used present tense, the past tense, use less when completed, the past is finished now, tense and other composite tense basic need not.
当进行时已变成过去时，也未能净化我周边。
When what's going on becomes a part of the past, it still can't purify things around.
当进行时已变成过去时，也未能净化我周边。
When what's going on becomes a part of the past, it still can't purify things around.
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