| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [v-ing] [to-vb] a | 622 |
|
| 2 | [prep] [v-ing] at a | 192 |
|
| 3 | [prep] [v-ing] [to-vb] at | 48 |
|
| 4 | [v-ing] [to-vb] at a | 29 |
|
