| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] must be [vb pp] | 2574 |
|
| 2 | [pron] must be [art] | 1225 |
|
| 3 | must be [vb pp] [art] | 160 |
|
| 4 | [pron] be [vb pp] [art] | 20 |
|
