| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be shown to be [adj] | 196 |
|
| 2 | be shown to be [adj] | 189 |
|
| 3 | be [verb] to be essential | 13 |
|
| 4 | be [vb pp] to be essential | 10 |
|
| 5 | be shown [prep] be essential | 5 |
|
| 6 | be shown to be essential | 5 |
|
| 7 | be shown to be essential | 5 |
|
| 8 | be show to be essential | 5 |
|
| 9 | be shown to [be] essential | 5 |
|
| 10 | [be] shown to be essential | 5 |
|
| 11 | be shown [prep] be essential | 5 |
|
