| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [subord] it [vb past] [been] [prep] | 165 |
|
| 2 | [subord] it [vb past] [prep] [det] | 94 |
|
| 3 | [subord] it [vb past] [been] [det] | 18 |
|
| 4 | it [vb past] [been] [prep] [det] | 15 |
|
