| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [vb past] [verb] [noun] | 588 |
|
| 2 | when it [vb past] [verb] | 205 |
|
| 3 | when it [verb] [noun] | 190 |
|
| 4 | when it [vb past] [noun] | 110 |
|
