| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | has [been] [vb pp] | 33309 |
|
| 2 | has [vb pp] a | 8835 |
|
| 3 | has [been] a | 3147 |
|
| 4 | [been] [vb pp] a | 1298 |
|
