| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | been [v-ing] [prep] a | 582 |
|
| 2 | been [v-ing] [prep] [det] | 545 |
|
| 3 | [v-ing] [prep] a [det] | 206 |
|
| 4 | been [v-ing] a [det] | 21 |
|
| 5 | been [prep] a [det] | 16 |
|
