| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] be [adj] | 36645 |
|
| 2 | [prep] be [adj] | 31844 |
|
| 3 | [prep] be essential | 52 |
|
| 4 | [prep] [be] essential | 52 |
|
| 5 | [prep] [be] essential | 48 |
|
| 6 | [prep] be essential | 48 |
|
