| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] have been [verb] in a | 38 |
|
| 2 | [vb mod] have [been] [verb] in a | 38 |
|
| 3 | [vb mod] have [been] [verb] in a | 38 |
|
| 4 | [vb mod] have [been] [vb pp] in a | 33 |
|
| 5 | could have [been] [verb] in a | 12 |
|
| 6 | might have [been] [verb] in a | 9 |
|
| 7 | may have [been] [verb] in a | 7 |
|
| 8 | [vb mod] have [been] [v-ing] in a | 5 |
|
