| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [modal v] [vb infin] | 33369 |
|
| 2 | [pron] must [vb infin] | 19989 |
|
| 3 | [pers pn] must [vb infin] | 18264 |
|
| 4 | it must [verb] | 1992 |
|
| 5 | it must [vb infin] | 1990 |
|
