| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] have been [adj] [num] | 57 |
|
| 2 | [modal v] have been [adj] year | 32 |
|
| 3 | have been [adj] [num] year | 31 |
|
| 4 | [modal v] have been [num] year | 23 |
|
