| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [vb mod] have been [adj] | 1070 |
|
| 2 | it [modal v] have been [adj] | 1070 |
|
| 3 | [pron] must have been [adj] | 445 |
|
| 4 | [pers pn] must have been [adj] | 322 |
|
| 5 | it must have [been] [adj] | 156 |
|
| 6 | it must have been [adj] | 156 |
|
| 7 | it must have been [adj] | 156 |
|
| 8 | it must have [be] [adj] | 156 |
|
| 9 | it must have be [adj] | 156 |
|
| 10 | it must [verb] been [adj] | 156 |
|
