| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is for [pron] [verb] | 148 |
|
| 2 | necessary for [pron] [verb] | 142 |
|
| 3 | is necessary for [pron] | 45 |
|
| 4 | is necessary for [verb] | 9 |
|
