| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] be [vb pp] [prep] | 38936 |
|
| 2 | [v-ing] [prep] be [vb pp] | 2436 |
|
| 3 | [v-ing] [prep] be [prep] | 597 |
|
| 4 | [v-ing] [prep] [vb pp] [prep] | 13 |
|
