| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] is not [verb] | 1790 |
|
| 2 | [pron] is necessary [verb] | 1085 |
|
| 3 | [pron] is not necessary | 250 |
|
| 4 | is not necessary [verb] | 182 |
|
