| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it must [vb infin] [vb pp] [art] | 55 |
|
| 2 | it must [vb infin] [vb pp] [art] | 55 |
|
| 3 | it must [vb infin] [vb pp] a | 38 |
|
| 4 | it [modal v] [vb infin] [vb pp] an | 29 |
|
| 5 | it [vb mod] [vb infin] [vb pp] an | 29 |
|
| 6 | [pron] must [vb infin] [vb pp] an | 29 |
|
| 7 | it must [verb] [vb pp] an | 6 |
|
| 8 | it must [vb infin] [vb pp] an | 6 |
|
| 9 | it must [vb infin] [verb] an | 6 |
|
