| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | been [v-ing] [prep] a | 665 |
|
| 2 | not [v-ing] [prep] a | 268 |
|
| 3 | not been [v-ing] [prep] | 111 |
|
| 4 | not been [prep] a | 75 |
|
| 5 | not been [v-ing] a | 14 |
|
