| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must have been [verb] [adv prt] [prep] | 36 |
|
| 2 | must have been [verb] [adv prt] [prep] | 36 |
|
| 3 | must have been [vb pp] [adv prt] [prep] | 27 |
|
| 4 | must have been [verb] out [prep] | 10 |
|
| 5 | must have been [v-ing] [adv prt] [prep] | 9 |
|
| 6 | must have been [verb] up [prep] | 8 |
|
| 7 | must have been [verb] [adv prt] by | 6 |
|
| 8 | must have been [verb] [adv prt] by | 6 |
|
| 9 | must have been [verb] [adv prt] with | 5 |
|
| 10 | must have been [verb] [adv prt] with | 5 |
|
