| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is [vb pp] [prep] [be] necessary | 15 |
|
| 2 | [is] [vb pp] [prep] be necessary | 15 |
|
| 3 | [is] [vb pp] [prep] [be] necessary | 15 |
|
| 4 | [is] [vb pp] to [be] necessary | 15 |
|
| 5 | [is] [vb pp] to [be] necessary | 15 |
|
| 6 | [is] [vb pp] [prep] be necessary | 15 |
|
| 7 | [is] [vb pp] [prep] [be] necessary | 15 |
|
