| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is [not/n't] for [pron] [to-vb] | 46 |
|
| 2 | is necessary for [pron] [to-vb] | 29 |
|
| 3 | [not/n't] necessary for [pron] [to-vb] | 15 |
|
| 4 | is [not/n't] necessary for [pron] | 13 |
|
