| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | there have been [art] [adj] | 1493 |
|
| 2 | years there have been [art] | 98 |
|
| 3 | years there have been [adj] | 31 |
|
| 4 | years have been [art] [adj] | 19 |
|
