| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb past] [verb] at [art] | 1372 |
|
| 2 | [vb past] [v-ing] at [art] | 187 |
|
| 3 | [vb past] knocking [prep] [art] | 15 |
|
| 4 | [vb past] knock at [art] | 12 |
|
| 5 | [verb] knocking at [art] | 9 |
|
