| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [vb pp] to [be] necessary | 42 |
|
| 2 | be [vb pp] to [be] necessary | 42 |
|
| 3 | be [vb pp] to be necessary | 42 |
|
| 4 | be [vb pp] to be necessary | 42 |
|
| 5 | is [vb pp] to [be] necessary | 15 |
|
| 6 | was [vb pp] to [be] necessary | 9 |
|
| 7 | be shown to [be] necessary | 8 |
|
| 8 | be thought to [be] necessary | 8 |
|
| 9 | are [vb pp] to [be] necessary | 6 |
|
| 10 | were [vb pp] to [be] necessary | 5 |
|
