| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | years have been [prep] | 27 |
|
| 2 | years [vb -s] been [prep] | 17 |
|
| 3 | years has been [prep] | 17 |
|
| 4 | years [vb base] been [prep] | 7 |
|
| 5 | years have been [prep] | 7 |
|
| 6 | years [verb] been in | 6 |
|
