| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | been [verb] [prep] a | 7446 |
|
| 2 | [verb] [v-ing] [prep] a | 1401 |
|
| 3 | been [v-ing] [prep] a | 665 |
|
| 4 | been [verb] [v-ing] [prep] | 181 |
|
| 5 | been [verb] [v-ing] a | 40 |
|
