| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it must [verb] | 1992 |
|
| 2 | it must [vb infin] | 1990 |
|
| 3 | it [modal v] provide | 311 |
|
| 4 | [pron] must provide | 178 |
|
| 5 | [pers pn] must provide | 175 |
|
| 6 | it must provide | 9 |
|
| 7 | it must provide | 9 |
|
