| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must be [verb] at [art] | 88 |
|
| 2 | must be [verb] at [art] | 88 |
|
| 3 | must be [verb] at [art] | 88 |
|
| 4 | must be [vb pp] at [art] | 82 |
|
| 5 | must be [verb] at the | 66 |
|
| 6 | must be [verb] at a | 11 |
|
| 7 | must be [verb] at an | 8 |
|
| 8 | must be made at [art] | 6 |
|
| 9 | must be [v-ing] at [art] | 6 |
|
| 10 | must be make at [art] | 6 |
|
