| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been [prep] [pron] [noun sg] | 311 |
|
| 2 | must have been [prep] [pron] | 34 |
|
| 3 | must have been [prep] [noun sg] | 25 |
|
| 4 | must have been [pron] [noun sg] | 9 |
|
| 5 | must have [prep] [pron] [noun sg] | 7 |
|
