| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adj] [conj] [noun pl] [be] to [be] | 17 |
|
| 2 | essential [conj] [noun] [be] to [be] | 9 |
|
| 3 | essential [conj] [noun pl] [be] to [be] | 5 |
|
| 4 | essential [conj] [noun pl] [be] [prep] [be] | 5 |
|
