| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must be [verb] at the | 66 |
|
| 2 | must be [verb] at the | 66 |
|
| 3 | must be [vb pp] at the | 63 |
|
| 4 | must be make at the | 5 |
|
| 5 | must be made at the | 5 |
|
