| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it must [verb] | 1992 |
|
| 2 | it must [vb infin] | 1990 |
|
| 3 | it [modal v] follow | 79 |
|
| 4 | [pron] must follow | 50 |
|
| 5 | [pers pn] must follow | 49 |
|
| 6 | it must follow | 18 |
|
| 7 | it must follow | 18 |
|
