| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [vb past] [prep] a [adj] | 481 |
|
| 2 | it [vb past] [been] a [adj] | 306 |
|
| 3 | [vb past] [been] [prep] a [adj] | 90 |
|
| 4 | it [vb past] [been] [prep] [adj] | 61 |
|
| 5 | it [vb past] [been] [prep] a | 21 |
|
