| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | been shown to be [adj] | 96 |
|
| 2 | been found to be [adj] | 45 |
|
| 3 | been [vb pp] to be effective | 22 |
|
| 4 | been held to be [adj] | 10 |
|
| 5 | been designed to be [adj] | 9 |
|
| 6 | been reported to be [adj] | 8 |
|
| 7 | been [vb pp] to be present | 8 |
|
| 8 | been [vb pp] to be important | 7 |
|
| 9 | been assumed to be [adj] | 5 |
|
| 10 | been [vb pp] to be useful | 5 |
|
