| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is not always necessary [to-vb] | 9 |
|
| 2 | be not always necessary [to-vb] | 9 |
|
| 3 | [is] not always necessary [to-vb] | 9 |
|
| 4 | [be] not always necessary [to-vb] | 9 |
|
| 5 | not always necessary [to-vb] [art] | 5 |
|
| 6 | not always necessary [to-vb] [art] | 5 |
|
