| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | years have been | 358 |
|
| 2 | years has been | 195 |
|
| 3 | years [vb -s] been | 195 |
|
| 4 | years [vb base] been | 93 |
|
| 5 | years have been | 93 |
|
| 6 | years [vb past] been | 66 |
|
| 7 | years had been | 66 |
|
