| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun sg] have been [prep] | 1527 |
|
| 2 | [noun sg] must have been | 546 |
|
| 3 | must have been [prep] | 294 |
|
| 4 | [noun sg] must have [prep] | 24 |
|
