| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have [been] [vb pp] for | 3821 |
|
| 2 | must have [been] [vb pp] | 496 |
|
| 3 | must have [vb pp] for | 37 |
|
| 4 | must have [been] for | 14 |
|
