| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [vb past] [prep] [det] [noun] | 190 |
|
| 2 | when it [vb past] [prep] [noun] | 166 |
|
| 3 | when it [vb past] [prep] [det] | 16 |
|
| 4 | when it [vb past] [det] [noun] | 7 |
|
