| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] have been [v-ing] [prep] a | 28 |
|
| 2 | [vb mod] have been [v-ing] [prep] a | 28 |
|
| 3 | might have been [v-ing] [prep] a | 6 |
|
| 4 | might have been [v-ing] [prep] a | 6 |
|
| 5 | must have been [v-ing] [prep] a | 5 |
|
| 6 | must have been [v-ing] [prep] a | 5 |
|
| 7 | would have been [v-ing] [prep] a | 5 |
|
| 8 | may have been [v-ing] [prep] a | 5 |
|
| 9 | may have been [v-ing] [prep] a | 5 |
|
| 10 | have been [v-ing] [pron] [prep] a | 6 |
|
| 11 | have been [v-ing] [pers pn] [prep] a | 5 |
|
| 12 | have been [v-ing] [prep] a [noun] | 16 |
|
| 13 | have been [v-ing] [prep] a [noun sg] | 16 |
|
| 14 | have been [v-ing] [prep] a [adj] | 12 |
|
| 15 | have been [v-ing] [prep] a [adj] | 12 |
|
