| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] have been [num] year | 22 |
|
| 2 | [modal v] have been [num] years | 22 |
|
| 3 | would have been [num] year | 13 |
|
| 4 | would have been [num] year | 12 |
|
