| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | when he [verb] [pers pn] necessary | 6 |
|
| 2 | when he [verb] [pron] necessary | 6 |
|
| 3 | when he [vb past] [pron] necessary | 6 |
|
| 4 | when he [verb] it necessary | 5 |
|
| 5 | when he [verb] it necessary | 5 |
|
