| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | shown [prep] be [adj] | 235 |
|
| 2 | shown [prep] be [adj] | 227 |
|
| 3 | [verb] [prep] be essential | 32 |
|
| 4 | [vb pp] [prep] be essential | 14 |
|
| 5 | shown [prep] [be] essential | 5 |
|
| 6 | shown [prep] be essential | 5 |
|
| 7 | shown [prep] be essential | 5 |
|
| 8 | show [prep] be essential | 5 |
|
