| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been [verb] for some years | 24 |
|
| 2 | have been [vb pp] for some [noun pl] | 22 |
|
| 3 | had been [verb] for some [noun pl] | 18 |
|
| 4 | have been [v-ing] for some [noun pl] | 16 |
|
| 5 | has been [verb] for some [noun pl] | 12 |
|
