| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | when they [verb] first | 23 |
|
| 2 | when they [verb] first | 23 |
|
| 3 | when they [vb past] first | 22 |
|
| 4 | when they have first | 22 |
|
| 5 | when they had first | 15 |
|
| 6 | when they 'd first | 7 |
|
