| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [modal v] [verb] | 33714 |
|
| 2 | [vb past] it [verb] | 4322 |
|
| 3 | [vb past] it [modal v] | 2396 |
|
| 4 | [vb past] [modal v] [verb] | 496 |
|
