| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [be] essential [conj] a | 27 |
|
| 2 | be essential [conj] a | 27 |
|
| 3 | [be] essential [conj] a | 24 |
|
| 4 | is essential [conj] a | 24 |
|
| 5 | [is] essential [conj] a | 24 |
|
| 6 | [be] essential that a | 18 |
|
| 7 | [be] essential that a | 18 |
|
| 8 | [be] essential [that] a | 18 |
|
| 9 | [be] essential [subord] a | 8 |
|
