| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb past] been [v-ing] [adv] for [noun pl] | 13 |
|
| 2 | had been [v-ing] [adv] for [noun] | 12 |
|
| 3 | [vb past] been [v-ing] [adv] for year | 6 |
|
| 4 | [vb past] been [v-ing] [adv] for years | 6 |
|
