| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pers pn] [vb past] necessary for | 7 |
|
| 2 | [pron] [vb past] necessary for | 7 |
|
| 3 | [vb past] it necessary for | 13 |
|
| 4 | [vb past] [pron] necessary for | 13 |
|
| 5 | [vb past] [pers pn] necessary for | 13 |
|
| 6 | [vb past] it necessary for | 13 |
|
| 7 | [vb past] [been] necessary for | 5 |
|
| 8 | [vb past] be necessary for | 5 |
|
| 9 | [vb past] [be] necessary for | 5 |
|
| 10 | [vb past] been necessary for | 5 |
|
