| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [be] necessary [to-vb] [prep] | 80 |
|
| 2 | necessary [to-vb] [pers pn] [prep] | 71 |
|
| 3 | [be] [to-vb] [pers pn] [prep] | 29 |
|
| 4 | [be] necessary [to-vb] [pers pn] | 29 |
|
