| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | while they were [v-ing] [prep] the | 9 |
|
| 2 | while they were [verb] [prep] the | 9 |
|
| 3 | while they were [adv] [prep] the | 5 |
|
| 4 | while they were [prep] the [noun] | 14 |
|
| 5 | while they were [prep] the [noun sg] | 11 |
|
