| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must have [been] [art] [adj] | 237 |
|
| 2 | [adv] have [been] [art] [adj] | 185 |
|
| 3 | must [adv] have [been] [art] | 29 |
|
| 4 | must [adv] have [been] [adj] | 28 |
|
| 5 | must [adv] have [art] [adj] | 24 |
|
