| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb past] [v-ing] [prep] | 4392 |
|
| 2 | [vb past] [prep] an | 4217 |
|
| 3 | [v-ing] [prep] an | 4147 |
|
| 4 | [vb past] [v-ing] an | 87 |
|
