| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must have been [verb] [prep] | 318 |
|
| 2 | have been [verb] [adv prt] [prep] | 248 |
|
| 3 | must have [verb] [adv prt] [prep] | 69 |
|
| 4 | must have been [verb] [adv prt] | 58 |
|
| 5 | must have been [adv prt] [prep] | 19 |
|
