| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] to [be] essential | 31 |
|
| 2 | [verb] [prep] be essential | 31 |
|
| 3 | [vb pp] [prep] [be] essential | 13 |
|
| 4 | seem [prep] [be] essential | 7 |
|
| 5 | [vb past] [prep] [be] essential | 6 |
|
| 6 | show [prep] [be] essential | 5 |
|
| 7 | shown [prep] [be] essential | 5 |
|
