| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] is [vb pp] [prep] [be] necessary | 7 |
|
| 2 | [noun sg] is [vb pp] [prep] [be] necessary | 7 |
|
| 3 | is [vb pp] [prep] [be] necessary [prep] | 5 |
|
| 4 | is [vb pp] [prep] [be] necessary [prep] | 5 |
|
