| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be necessary for | 754 |
|
| 2 | [is] necessary for | 282 |
|
| 3 | is necessary for | 269 |
|
| 4 | be necessary for | 203 |
|
| 5 | [be] necessary for | 203 |
|
| 6 | [was/were] necessary for | 147 |
|
| 7 | was necessary for | 127 |
|
| 8 | are necessary for | 91 |
|
| 9 | [am/are] necessary for | 91 |
|
| 10 | been necessary for | 27 |
|
| 11 | [been] necessary for | 27 |
|
| 12 | were necessary for | 20 |
|
| 13 | 's necessary for | 13 |
|
