| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | had been [v-ing] [prep] [det] | 127 |
|
| 2 | been [v-ing] [prep] [det] years | 37 |
|
| 3 | had been [v-ing] [prep] years | 18 |
|
| 4 | had been [prep] [det] years | 10 |
|
