| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | which [vb past] [prep] | 8214 |
|
| 2 | [vb past] [v-ing] [prep] | 4396 |
|
| 3 | which [vb past] [v-ing] | 317 |
|
| 4 | which [v-ing] [prep] | 53 |
|
