| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [subord] it become necessary | 18 |
|
| 2 | [subord] it became necessary | 12 |
|
| 3 | when it become necessary | 8 |
|
| 4 | if it become necessary | 8 |
|
| 5 | [subord] it becomes necessary | 6 |
|
