| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] time when | 189 |
|
| 2 | [prep] time when | 189 |
|
| 3 | at time [adv] | 179 |
|
| 4 | at [noun] when | 172 |
|
| 5 | at time when | 75 |
|
