| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [v-ing] a | 20914 |
|
| 2 | [v-ing] for a | 4459 |
|
| 3 | [prep] [v-ing] for | 4187 |
|
| 4 | [prep] for a | 147 |
|
