| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pers pn] is not essential [to-vb] | 7 |
|
| 2 | it is not essential [to-vb] | 7 |
|
| 3 | [pron] is not essential [to-vb] | 7 |
|
| 4 | it is not essential [to-vb] | 7 |
|
