| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must be [prep] | 1101 |
|
| 2 | must be [prep] | 1101 |
|
| 3 | [vb mod] be for | 833 |
|
| 4 | [modal v] be for | 833 |
|
| 5 | must be for | 75 |
|
| 6 | must [be] for | 75 |
|
| 7 | must be for | 75 |
|
