| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [vb past] become [adj] | 130 |
|
| 2 | it [verb] become necessary | 10 |
|
| 3 | [pers pn] [vb past] become necessary | 7 |
|
| 4 | [pron] [vb past] become necessary | 7 |
|
| 5 | it [vb past] [verb] necessary | 6 |
|
| 6 | it [vb past] become necessary | 6 |
|
