| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | had been [v-ing] for [det] | 78 |
|
| 2 | been [v-ing] for [det] years | 37 |
|
| 3 | had been [v-ing] for years | 18 |
|
| 4 | had been for [det] years | 10 |
|
