| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | while [verb] at the [noun sg] | 26 |
|
| 2 | while [v-ing] at the [noun sg] | 25 |
|
| 3 | while working at the [noun sg] | 7 |
|
| 4 | while work at the [noun sg] | 7 |
|
