| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must be [verb] at [det] [noun pl] | 24 |
|
| 2 | must be [verb] at [det] [noun pl] | 24 |
|
| 3 | must be [vb pp] at [det] [noun pl] | 24 |
|
| 4 | must be [verb] at [det] [noun pl] | 24 |
|
| 5 | must be [verb] at all [noun pl] | 22 |
|
| 6 | must be [verb] at [det] costs | 15 |
|
| 7 | must be avoided at [det] [noun pl] | 8 |
|
| 8 | must be avoid at [det] [noun pl] | 8 |
|
| 9 | must be [verb] at [det] times | 5 |
|
