| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | not been [v-ing] [prep] a | 11 |
|
| 2 | not been [v-ing] [prep] a | 10 |
|
| 3 | n't been [v-ing] [prep] a | 6 |
|
| 4 | not been [v-ing] [prep] a | 5 |
|
