| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must always [vb infin] [prep] | 47 |
|
| 2 | must [adv] [vb infin] at | 39 |
|
| 3 | must [adv] [vb infin] at | 26 |
|
| 4 | [modal v] always [vb infin] at | 19 |
|
| 5 | must always [verb] at | 5 |
|
| 6 | must always [vb infin] at | 5 |
|
