No | Pattern | Freq | Relations |
---|---|---|---|
1 | it must have [be] [v-ing] [prep] | 8 |
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2 | it must [verb] [be] [v-ing] [prep] | 8 |
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3 | it must [verb] [been] [v-ing] [prep] | 8 |
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4 | it must [verb] be [v-ing] [prep] | 8 |
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5 | it must [vb infin] [be] [v-ing] [prep] | 8 |
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6 | it must [verb] been [v-ing] [prep] | 8 |
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7 | it must have [be] [v-ing] [prep] | 7 |
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