| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | been [verb] [prep] a | 6345 |
|
| 2 | not [verb] [prep] a | 3039 |
|
| 3 | not been [verb] [prep] | 1768 |
|
| 4 | not been [prep] a | 68 |
|
| 5 | not been [verb] a | 48 |
|
