| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it must [verb] | 1992 |
|
| 2 | it must [vb infin] | 1990 |
|
| 3 | it [modal v] give | 470 |
|
| 4 | [pron] must give | 150 |
|
| 5 | it must give | 13 |
|
