| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] must have been [prep] [adj] | 33 |
|
| 2 | [pron] must have been [prep] [det] | 21 |
|
| 3 | [pron] [modal v] have been [prep] this | 17 |
|
| 4 | [pron] must [verb] been [prep] this | 7 |
|
| 5 | [pron] must have been [prep] this | 7 |
|
| 6 | [pron] must have been [prep] this | 7 |
|
| 7 | [pron] must have be [prep] this | 7 |
|
| 8 | [pron] must have [be] [prep] this | 7 |
|
| 9 | [pron] must have [been] [prep] this | 7 |
|
