| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] [not/n't] [been] [prep] [det] a | 5 |
|
| 2 | had [not/n't] [been] [prep] [det] a | 5 |
|
| 3 | [vb past] [not/n't] [been] [prep] [det] a | 5 |
|
| 4 | have [not/n't] [been] [prep] [det] a | 5 |
|
