| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [v-ing] a | 20914 |
|
| 2 | [prep] [v-ing] in | 6068 |
|
| 3 | [v-ing] in a | 4159 |
|
| 4 | [prep] in a | 420 |
|
