進行形の文では、動詞のing形、つまり現在分詞となります。
tbd
In a progressive tense sentence it becomes the -ing form verb, that is the present participle.
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例文は過去進行形の文です。皆さんは進行形を学習するとき、どのように教わりましたか？
tbd
The example is a past progressive tense sentence. How was everybody taught when they were learning about progressive tense?
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