| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] have been a | 1695 |
|
| 2 | [vb mod] have been a | 1695 |
|
| 3 | would have been a | 498 |
|
| 4 | would have been a | 482 |
|
| 5 | must have been a | 426 |
|
| 6 | must have been a | 426 |
|
| 7 | [adv] have been a | 330 |
|
| 8 | [adv] have been a | 222 |
|
| 9 | could have been a | 219 |
|
| 10 | could have been a | 219 |
|
| 11 | may have been a | 209 |
|
| 12 | may have been a | 209 |
|
| 13 | might have been a | 198 |
|
| 14 | might have been a | 198 |
|
| 15 | should have been a | 130 |
|
| 16 | should have been a | 130 |
|
| 17 | [not/n't] have been a | 108 |
|
| 18 | not have been a | 108 |
|
| 19 | not have been a | 72 |
|
| 20 | well have been a | 46 |
|
| 21 | well have been a | 46 |
|
| 22 | n't have been a | 36 |
|
| 23 | also have been a | 19 |
|
| 24 | also have been a | 19 |
|
| 25 | [pron] have been a | 17 |
|
| 26 | 'd have been a | 16 |
|
| 27 | [pers pn] have been a | 16 |
|
| 28 | hardly have been a | 14 |
|
| 29 | hardly have been a | 14 |
|
| 30 | will have been a | 14 |
|
