| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must [verb] at [art] | 93 |
|
| 2 | must [vb infin] at [art] | 93 |
|
| 3 | [vb mod] start at [art] | 30 |
|
| 4 | [modal v] start at [art] | 30 |
|
| 5 | must start [prep] [art] | 22 |
|
| 6 | must start [prep] [art] | 22 |
|
| 7 | must start at [art] | 6 |
|
| 8 | must start at [art] | 6 |
|
| 9 | must start at [art] | 6 |
|
| 10 | must start at [art] | 6 |
|
