| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] must have been on | 14 |
|
| 2 | [pers pn] must have been on | 13 |
|
| 3 | it must have been on | 6 |
|
| 4 | it must have been on | 6 |
|
| 5 | must have been [verb] on | 22 |
|
| 6 | must have been [vb pp] on | 12 |
|
| 7 | must have been [v-ing] on | 10 |
|
| 8 | must have been [adj] on | 6 |
|
| 9 | must have been [adj] on | 6 |
|
| 10 | must have been on [art] | 11 |
|
| 11 | must have been on [art] | 11 |
|
| 12 | must have been on the | 8 |
|
| 13 | must have been on the | 8 |
|
