| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [vb mod] have been [prep] [det] | 31 |
|
| 2 | it [vb mod] have [been] [prep] [det] | 30 |
|
| 3 | it must have [been] [prep] [det] | 15 |
|
| 4 | it [vb mod] have [been] [prep] this | 10 |
|
| 5 | it [vb mod] have [been] [prep] that | 7 |
|
| 6 | it [vb mod] have [been] in [det] | 6 |
|
| 7 | it may have [been] [prep] [det] | 5 |
|
| 8 | it would have [been] [prep] [det] | 5 |
|
