| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be necessary for [det] [noun] | 44 |
|
| 2 | [modal v] be for [det] [noun] | 36 |
|
| 3 | [modal v] be necessary for [det] | 18 |
|
| 4 | [modal v] be necessary for [noun] | 17 |
|
