| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [vb mod] have been [adj] years | 12 |
|
| 2 | it [vb mod] [vb infin] been [adj] years | 12 |
|
| 3 | it [vb mod] [verb] been [num] years | 10 |
|
| 4 | it [vb mod] have been [adj] years | 10 |
|
