| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | when it [num ord] [vb past] [prep] | 10 |
|
| 2 | when it [num ord] [vb past] [prep] | 10 |
|
| 3 | when it [num ord] [vb past] [prep] | 10 |
|
| 4 | when it first [vb past] [prep] | 10 |
|
