| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [v-ing] at the time [prep] | 62 |
|
| 2 | [v-ing] at [art] time of | 60 |
|
| 3 | [v-ing] at a time [prep] | 7 |
|
| 4 | working at [art] time [prep] | 6 |
|
| 5 | existing at [art] time [prep] | 5 |
|
| 6 | driving at [art] time [prep] | 5 |
|
