| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been [vb pp] [prep] three years | 18 |
|
| 2 | [verb] been [vb pp] for three years | 14 |
|
| 3 | has been [vb pp] [prep] three years | 11 |
|
| 4 | [vb -s] been [vb pp] [prep] three years | 11 |
|
| 5 | [vb past] been [vb pp] [prep] three years | 5 |
|
| 6 | had been [vb pp] [prep] three years | 5 |
|
