| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | not be [verb] for [det] years | 8 |
|
| 2 | not [be] [vb pp] for [det] years | 8 |
|
| 3 | not [been] [verb] for [det] years | 5 |
|
| 4 | not been [verb] for [det] years | 5 |
|
