| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb past] at [art] | 9210 |
|
| 2 | [v-ing] at [art] | 8757 |
|
| 3 | [vb past] [v-ing] [art] | 2144 |
|
| 4 | [vb past] [v-ing] at | 551 |
|
