| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [v-ing] [prep] a | 27362 |
|
| 2 | while [v-ing] [prep] | 1190 |
|
| 3 | while [v-ing] a | 384 |
|
| 4 | while [prep] a | 124 |
|
