During the past ten years there have been dramatic changes in the international situation.

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During the past ten years there have been dramatic changes in the international situation.

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The sales of private cars have increased 40 percent in the past ten years.

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During the ten thousand miles journey across the desert, a great number of people dropped with ___.

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We_ _ have proved great adventurers, but we have done the greatest march ever made inthe past ten years.

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A teacher showed students an example and explained the usage of past perfect tense, and ask students to list ten “past perfect tense” sentences by imitating that example. What’s teachers grammar teaching method?

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