| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [conj] [v-ing] [prep] | 19874 |
|
| 2 | [v-ing] [prep] an | 4148 |
|
| 3 | [conj] [prep] an | 2695 |
|
| 4 | [conj] [v-ing] an | 1050 |
|
