| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | had been [verb] for several [noun pl] | 17 |
|
| 2 | had been [verb] for several [noun] | 17 |
|
| 3 | had been [verb] for several [noun] | 17 |
|
| 4 | had been [v-ing] for several [noun] | 10 |
|
| 5 | had been [verb] for several year | 8 |
|
| 6 | had been [verb] for several years | 8 |
|
| 7 | had been [vb pp] for several [noun] | 7 |
|
