| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [modal v] [vb infin] | 33370 |
|
| 2 | [vb past] it [modal v] | 2398 |
|
| 3 | [vb past] it [vb infin] | 1350 |
|
| 4 | [vb past] [modal v] [vb infin] | 485 |
|
