| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been [vb pp] for some years | 15 |
|
| 2 | had been [verb] for some years | 11 |
|
| 3 | have been [v-ing] for some years | 9 |
|
| 4 | has been [verb] for some years | 8 |
|
