| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it be essential [prep] [noun pl] [to-vb] | 5 |
|
| 2 | [pron] be essential [prep] [noun pl] [to-vb] | 5 |
|
| 3 | [pers pn] be essential [prep] [noun pl] [to-vb] | 5 |
|
| 4 | it be essential [prep] [noun pl] [to-vb] | 5 |
|
