| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [modal v] [adv] have [been] | 642 |
|
| 2 | it [modal v] have [been] a | 481 |
|
| 3 | [modal v] [adv] have [been] a | 283 |
|
| 4 | it [modal v] [adv] have a | 46 |
|
| 5 | it [adv] have [been] a | 7 |
|
