| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun sg] must [verb] been | 546 |
|
| 2 | [noun sg] [verb] been at | 119 |
|
| 3 | [noun sg] must [verb] at | 99 |
|
| 4 | must [verb] been at | 40 |
|
