| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it have [been] [vb pp] [prep] | 1838 |
|
| 2 | have [been] [vb pp] back [prep] | 176 |
|
| 3 | it have [vb pp] back [prep] | 17 |
|
| 4 | it have [been] [vb pp] back | 13 |
|
