No | Pattern | Freq | Relations |
---|---|---|---|
1 | had [been] [v-ing] [adv] for several | 5 |
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2 | had [be] [v-ing] [adv] for several | 5 |
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3 | had been [v-ing] [adv] for several | 5 |
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4 | had be [v-ing] [adv] for several | 5 |
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