| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | had been [verb] [prep] two years | 8 |
|
| 2 | [vb past] been [verb] [prep] two years | 8 |
|
| 3 | [vb past] been [verb] for two years | 7 |
|
| 4 | [vb past] been [v-ing] [prep] two years | 6 |
|
