| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a time when [noun prp] | 105 |
|
| 2 | at a time when [noun prp] | 101 |
|
| 3 | at a time when [noun prp] | 101 |
|
| 4 | [prep] a time when britain | 8 |
|
