| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | been [v-ing] [prep] a | 665 |
|
| 2 | 's been [v-ing] [prep] | 332 |
|
| 3 | 's been [prep] a | 59 |
|
| 4 | 's been [v-ing] a | 42 |
|
