| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [vb pp] to be essential | 10 |
|
| 2 | [be] [vb pp] to be essential | 10 |
|
| 3 | [vb pp] to be [art] essential | 6 |
|
| 4 | [vb pp] to be [art] essential | 6 |
|
| 5 | [vb pp] to be essential [prep] | 9 |
|
| 6 | [vb pp] to be essential [prep] | 9 |
|
| 7 | [vb pp] to be essential for | 5 |
|
| 8 | [vb pp] to be essential for | 5 |
|
