| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [subord] it have be necessary | 8 |
|
| 2 | [subord] it [verb] been necessary | 8 |
|
| 3 | [subord] it [verb] be necessary | 8 |
|
| 4 | [subord] it had be necessary | 6 |
|
| 5 | [subord] it [vb past] be necessary | 6 |
|
| 6 | if it [verb] be necessary | 5 |
|
