| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] must have been about | 34 |
|
| 2 | i must have been [adv] | 27 |
|
| 3 | [pers pn] must have been about | 26 |
|
| 4 | i must have been [adv] | 24 |
|
| 5 | i must have be about | 6 |
|
| 6 | i must [verb] been about | 6 |
|
| 7 | i must have been about | 6 |
|
| 8 | i must have [been] about | 6 |
|
| 9 | i must have [be] about | 6 |
|
| 10 | i [modal v] have been about | 6 |
|
| 11 | i must have been about | 6 |
|
| 12 | i must have been about | 6 |
|
| 13 | i must [vb infin] been about | 6 |
|
| 14 | i must have been about | 6 |
|
| 15 | i [vb mod] have been about | 6 |
|
