| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must be [verb] [prep] | 5097 |
|
| 2 | must be [vb pp] [prep] | 4921 |
|
| 3 | [vb mod] be found [prep] | 1355 |
|
| 4 | [modal v] be found [prep] | 1355 |
|
| 5 | must be find [prep] | 38 |
|
| 6 | must [be] found [prep] | 38 |
|
| 7 | must be found [prep] | 38 |
|
| 8 | must be found [prep] | 38 |
|
