| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is not necessary [verb] | 182 |
|
| 2 | is not always [verb] | 108 |
|
| 3 | is not always necessary | 14 |
|
| 4 | not always necessary [verb] | 9 |
|
| 5 | is always necessary [verb] | 8 |
|
