| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | has [be] [vb pp] to [be] effective | 13 |
|
| 2 | has been [verb] to [be] effective | 13 |
|
| 3 | has be [verb] to [be] effective | 13 |
|
| 4 | has [been] [verb] to [be] effective | 13 |
|
| 5 | has [be] [verb] to be effective | 13 |
|
| 6 | has [be] show to [be] effective | 9 |
|
| 7 | has [be] shown to [be] effective | 9 |
|
