| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | at the time when [noun] | 41 |
|
| 2 | the time when [adj] [noun] | 27 |
|
| 3 | at the time when [adj] | 6 |
|
| 4 | at the time [adj] [noun] | 6 |
|
