| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have [not/n't] been [prep] [num] years | 5 |
|
| 2 | [verb] [not/n't] been [prep] [num] years | 5 |
|
| 3 | [not/n't] been [verb] [prep] [num] years | 18 |
|
| 4 | [not/n't] been [vb pp] [prep] [num] years | 18 |
|
