| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] [be] [vb pp] for | 3951 |
|
| 2 | must [verb] [be] [vb pp] | 502 |
|
| 3 | must [be] [vb pp] for | 322 |
|
| 4 | must [verb] [vb pp] for | 38 |
|
| 5 | must [verb] [be] for | 14 |
|
