| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | been [vb pp] [prep] a | 6770 |
|
| 2 | been [v-ing] [prep] a | 665 |
|
| 3 | [vb pp] [v-ing] [prep] a | 332 |
|
| 4 | been [vb pp] [v-ing] [prep] | 170 |
|
| 5 | been [vb pp] [v-ing] a | 40 |
|
