| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | has [been] [vb pp] to be [adj] | 88 |
|
| 2 | [vb -s] been [vb pp] to be [adj] | 88 |
|
| 3 | [vb -s] [been] shown to be [adj] | 36 |
|
| 4 | [vb -s] [been] found to be [adj] | 17 |
|
| 5 | [vb -s] [been] [vb pp] to be effective | 13 |
|
| 6 | [vb -s] [been] designed to be [adj] | 5 |
|
| 7 | [vb -s] [been] held to be [adj] | 5 |
|
| 8 | [vb -s] [been] reported to be [adj] | 5 |
|
