| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | so it [modal v] [vb infin] | 213 |
|
| 2 | so [pron] must [vb infin] | 142 |
|
| 3 | [adv] it must [vb infin] | 137 |
|
| 4 | so it must [verb] | 27 |
|
