| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been [prep] [adj] [noun sg] | 767 |
|
| 2 | must have been [adj] [noun sg] | 61 |
|
| 3 | must have been [prep] [adj] | 51 |
|
| 4 | must have been [prep] [noun sg] | 25 |
|
