| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | been [v-ing] [prep] a | 665 |
|
| 2 | only [v-ing] [prep] a | 37 |
|
| 3 | only been [v-ing] [prep] | 22 |
|
| 4 | only been [prep] a | 8 |
|
