| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] must [verb] | 20007 |
|
| 2 | [pron] must [vb infin] | 19989 |
|
| 3 | [pron] [modal v] keep | 1809 |
|
| 4 | [pron] must keep | 167 |
|
