| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is necessary for [adj] [noun sg] | 25 |
|
| 2 | is necessary for [adj] [noun] | 22 |
|
| 3 | is necessary for [det] [noun] | 14 |
|
| 4 | is necessary for [adj] [noun pl] | 13 |
|
