| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must have be [vb pp] | 495 |
|
| 2 | must be [vb pp] for | 322 |
|
| 3 | have be [vb pp] for | 285 |
|
| 4 | must have [vb pp] for | 35 |
|
| 5 | must have be for | 14 |
|
