| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb pp] at [art] time of [v-ing] | 25 |
|
| 2 | [vb pp] at the time of [verb] | 23 |
|
| 3 | [vb pp] at [art] time of write | 5 |
|
| 4 | [vb pp] at [art] time of writing | 5 |
|
