过去完成时进行时是英语语法中的一个复杂时态,它用于描述过去某个时间点之前一直在发生的动作。下面是一些例句,帮助你更好地理解这个时态。
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我昨天五点钟已经在学习了两个小时了。(I had been studying for two hours at 5 pm yesterday.)
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他们在我到达之前已经在那里等了一个小时了。(They had been waiting there for an hour before I arrived.)
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我们到达机场时,飞机已经在起飞了。(When we got to the airport, the plane had been taking off.)
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他已经在这所学校学习了三年,在他离开之前一直在学习。(He had been studying at this school for three years before he left.)
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我们在这个项目上已经工作了两个月了,但还没有完成。(We had been working on this project for two months, but we hadn't finished yet.)
学习过去完成时进行时需要不断练习,在实际运用中多尝试,才能更好地掌握这个时态。希望这些例句能够帮助你更好地理解和运用过去完成时进行时。